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Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2010	Feb. 18, 2011	Jun. 30, 2010
Document And Entity Information
Document Type	10-K
Document Period End Date	Dec. 31, 2010
Document Fiscal Year Focus	2010
Document Fiscal Period Focus	FY
Entity Registrant Name	BOSTON PROPERTIES INC
Amendment Flag	false
Entity Voluntary Filers	No
Entity Central Index Key	0001037540
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Entity Common Stock, Shares Outstanding		141,864,497
Entity Public Float			$ 9,725,575,243

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	12 Months Ended
CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 31, 2009
ASSETS
Cash and cash equivalents	$ 478,948	$ 1,448,933
Investment in securities	8,732	9,946
Tenant and other receivables (net of allowance for doubtful accounts of $2,081 and $4,125, respectively)	129,818	93,240
Accrued rental income (net of allowance of $3,116 and $2,645, respectively)	442,683	363,121
Deferred charges, net	436,019	294,395
Investments in unconsolidated joint ventures	767,252	763,636
Total assets	13,348,263	12,348,703
Liabilities:
Unsecured exchangeable senior notes (net of discount of $8,249 and $15,529, respectively)	1,721,817	1,904,081
Unsecured line of credit
Accounts payable and accrued expenses	186,059	220,089
Dividends and distributions payable	81,031	80,536
Accrued interest payable	62,327	76,058
Total liabilities	$ 8,328,418	$ 7,223,992
Commitments and contingencies	#8212;	#8212;
Equity:
Excess stock, $.01 par value, 150,000,000 shares authorized, none issued or outstanding
Common stock, $.01 par value, 250,000,000 shares authorized, 140,278,005 and 138,958,910 issued and 140,199,105 and 138,880,010 outstanding in 2010 and 2009, respectively	1,402	1,389
Additional paid-in capital	4,417,162	4,373,679
Accumulated other comprehensive loss	(18,436)	(21,777)
Noncontrolling interests:
Total liabilities and equity	$ 13,348,263	$ 12,348,703

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009
Statement of Financial Position
Tenant and other receivables, allowance for doubtful accounts	$ 2,081	$ 4,125
Accrued rental income, allowance	3,116	2,645
Unsecured senior notes, discount	8,402	2,611
Unsecured exchangeable senior notes, discount	$ 8,249	$ 15,529
Excess stock, par value	$ 0.01	$ 0.01
Excess stock, shares authorized	150,000,000	150,000,000
Excess stock, issued	0	0
Excess stock, outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	140,278,005	138,958,910
Common stock, shares outstanding	140,199,105	138,880,010

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Revenue
Development and management services	$ 41,231	$ 34,878	$ 30,518
Expenses
Rental	501,694	501,799	488,030
Hotel	25,153	23,966	27,510
General and administrative	79,658	75,447	72,365
Acquisition costs	2,614
Depreciation and amortization	338,371	321,681	304,147
Total expenses	940,290	950,659	892,052
Income (loss) from unconsolidated joint ventures	36,774	12,058	(182,018)
Interest and other income	7,332	4,059	18,958
Gains (losses) from investments in securities	935	2,434	(4,604)
Interest expense	(378,079)	(322,833)	(295,322)
Losses from early extinguishments of debt	(89,883)	(510)
Net derivative losses			(17,021)
Income from continuing operations	187,593	262,739	97,383
Gains on sales of real estate	2,734	11,760	33,340
Net income attributable to noncontrolling interests:
Noncontrolling interest in gains on sales of real estate - common units of the Operating Partnership	$ (349)	$ (1,579)	$ (4,838)
Basic earnings per common share attributable to Boston Properties, Inc.:
Net income	$ 1.14	$ 1.76	$ 0.88
Diluted earnings per common share attributable to Boston Properties, Inc.:
Net income	$ 1.14	$ 1.76	$ 0.87

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Statement [Line Items]
Equity, shares	138,880,010
Rebalancing of noncontrolling interest-redeemable preferred units			$ 488
Allocated net income for the year	$ 186,984	$ 270,905	126,497
Dividends/distributions declared	(321,838)	(337,108)	(384,321)
Net activity from stock option and incentive plan, value	54,815	34,730	59,796
Acquisition of noncontrolling interest in property partnership	(25,482)
Repurchase of equity component of unsecured exchangeable senior notes	(439)
Equity component of unsecured exchangeable senior notes			91,947
Distributions to noncontrolling interests in property partnerships	(3,365)	$ (4,007)	(20,902)
Capped call transaction costs			(44,360)
Effective portion of interest rate contracts	$ 421		$ (727)
Equity, shares	140,199,105	138,880,010
Common Stock [Member]
Statement [Line Items]
Equity, shares	138,880,000	121,181,000	119,502,000
Net activity from stock option and incentive plan, shares	718,000	298,000	1,041,000
Net activity from stock option and incentive plan, value	$ 7	$ 3	$ 10
Equity, shares	140,199,000	138,880,000	121,181,000
Additional Paid-in Capital [Member]
Statement [Line Items]
Rebalancing of noncontrolling interest	$ 20,176	$ (42,490)	$ 24,287
Net activity from stock option and incentive plan, value	25,038	10,002	38,156
Acquisition of noncontrolling interest in property partnership	(19,098)
Repurchase of equity component of unsecured exchangeable senior notes	(439)
Equity component of unsecured exchangeable senior notes			91,947
Capped call transaction costs			(44,360)
Earnings (Dividends) in Excess of Dividends (Earnings) [Member]
Statement [Line Items]
Allocated net income for the year	159,072	231,014	105,270
Dividends/distributions declared	(279,268)	(290,534)	(326,713)
Accumulated Other Comprehensive Loss [Member]
Statement [Line Items]
Effective portion of interest rate contracts	367		(622)
Noncontrolling Interests [Member]
Statement [Line Items]
Rebalancing of noncontrolling interest	(20,176)	42,490	(24,287)
Rebalancing of noncontrolling interest-redeemable preferred units			488
Allocated net income for the year	27,912	39,891	21,227
Dividends/distributions declared	(42,570)	(46,574)	(57,608)
Net activity from stock option and incentive plan, value	29,770	24,725	21,630
Acquisition of noncontrolling interest in property partnership	(6,384)
Distributions to noncontrolling interests in property partnerships	(3,365)	$ (4,007)	(20,902)
Effective portion of interest rate contracts	$ 54		$ (105)

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Other comprehensive income (loss):
Net effective portion of interest rate contracts	$ 421		$ (727)
Comprehensive income	194,156	$ 277,403	129,998
Comprehensive income attributable to noncontrolling interests	(31,742)	(43,875)	(25,348)
Comprehensive income attributable to Boston Properties, Inc.	$ 162,414	$ 233,528	$ 104,650

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	$ 338,371	$ 321,681	$ 304,147
Settlement of accreted debt discount on repurchases of unsecured exchangeable senior notes	(17,555)
Losses (gains) from investments in securities	(935)	(2,434)	4,604
Net derivative losses			17,021
Losses from early extinguishments of debt	12,211	10
(Income) loss from unconsolidated joint ventures	(36,774)	(12,058)	182,018
Distributions of net cash flow from operations of unconsolidated joint ventures	16,734	12,676	9,589
Gains on sales of real estate	(2,734)	(11,760)	(33,340)
Change in assets and liabilities:
Cash held in escrows	(8,664)	103	3,548
Tenant and other receivables, net	(5,115)	1,844	2,663
Accrued rental income, net	(79,562)	(46,410)	(20,001)
Prepaid expenses and other assets	3,239	4,717	(2,642)
Accounts payable and accrued expenses	(32,839)	14,848	5,762
Accrued interest payable	(13,731)	8,926	12,645
Other liabilities	(9,393)	(9,452)	(54,023)
Tenant leasing costs	(59,513)	(46,280)	(57,809)
Total adjustments	185,566	342,877	434,588
Cash flows from investing activities:
Mortgage loan proceeds placed in escrow	(267,500)
Net proceeds from the sale/financing of real estate released from escrow			161,321
Cash flows from financing activities:
Repurchase of equity component of unsecured exchangeable senior notes	(439)
Payments on real estate financing transactions			(6,208)
Equity component of unsecured exchangeable senior notes			91,947
Capped call transaction costs			(44,360)
Net increase (decrease) in cash and cash equivalents	(969,985)	1,207,423	(1,265,411)
Cash and cash equivalents, beginning of the year	1,448,933	241,510	1,506,921
Cash and cash equivalents, end of the year	478,948	1,448,933	241,510
Supplemental disclosures:
Cash paid for interest	394,172	307,059	289,640
Interest capitalized	40,981	48,816	46,286
Non-cash investing and financing activities:
Additions to real estate included in accounts payable	3,693	36,789	18,075
Mortgage notes payable assumed in connection with acquisitions of real estate	843,104
Note receivable converted to real estate	22,500
Dividends and distributions declared but not paid	81,031	80,536	97,162
Issuance of OP Units in connection with the acquisition of real estate			15,000
Issuance of OP Units in connection with an investment in an unconsolidated joint venture			10,000
Conversions of noncontrolling interests to Stockholders' Equity	17,182	3,970	10,906
Basis adjustment in connection with conversions of minority interests to Stockholders Equity			21,641
Issuance of restricted securities to employees and directors	$ 19,222	$ 22,964	$ 43,536

Deferred Charges	12 Months Ended
Deferred Charges	Dec. 31, 2010
Notes to Financial Statements
Deferred Charges	div div p style="margin-top: 0px; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"b4.nbsp;nbsp;nbsp;nbsp;Deferred Charges /b/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"Deferred charges consisted of the following at Decembernbsp;31, (in thousands): /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p table border="0" cellspacing="0" cellpadding="0" width="90%" align="center" trtd width="75%" /td td valign="bottom" width="6%" /td td /td td /td td /td td valign="bottom" width="5%" /td td /td td /td td /td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2010/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2009/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Leasing costs (and lease related intangibles)/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"558,620/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"399,302/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Financing costs/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"89,680/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"76,915/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" /td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"648,300/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"476,217/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Less: Accumulated amortization/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(212,281/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(181,822/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" /td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"436,019/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"294,395/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td/tr/table/div /div

Investments in Unconsolidated Joint Ventures	12 Months Ended
Investments in Unconsolidated Joint Ventures	Dec. 31, 2010
Notes to Financial Statements
Investments in Unconsolidated Joint Ventures	div divfont style="font-family: Times New Roman;" class="_mt" size="2" /font div divfont style="font-family: Times New Roman;" class="_mt" size="2" /font div /divfont style="font-family: Times New Roman;" class="_mt" size="2" /font div p style="margin-top: 0px; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"b5.nbsp;nbsp;nbsp;nbsp;Investments in Unconsolidated Joint Ventures /b/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The investments in unconsolidated joint ventures consists of the following at Decembernbsp;31, 2010: /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p div class="MetaData" table border="0" cellspacing="0" cellpadding="0" width="100%" align="center" trtd width="50%" /td td valign="bottom" width="1%" /td td width="38%" /td td valign="bottom" width="1%" /td td /td/tr trtd style="border-bottom: #000000 1px solid;" valign="bottom" nowrap="nowrap" align="center" p style="margin-top: 0px; margin-bottom: 1px;" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bEntity/b/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" align="center" p style="margin-top: 0px; margin-bottom: 1px;" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bProperties/b/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bNominalnbsp;%br /Ownership/b/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Square 407 Limited Partnership/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"Marketnbsp;Squarenbsp;North/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"font class="_mt"font style="font-family: Times New Roman;" class="_mt" size="2"50.0/font/font%/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"The Metropolitan Square Associates LLC/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"Metropolitan Square/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"font class="_mt"font style="font-family: Times New Roman;" class="_mt" size="2"51.0/font/font%/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"BP/CRF 901 New York Avenue LLC/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"901nbsp;Newnbsp;Yorknbsp;Avenue/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"font class="_mt"font style="font-family: Times New Roman;" class="_mt" size="2"25.0/font/font%(1)/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"WP Project Developer LLC/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"Wisconsin Place Land and Infrastructure/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"font class="_mt"font style="font-family: Times New Roman;" class="_mt" size="2"33.3/font/font%(2)/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"RBP Joint Venture/fontfont style="font-family: Times New Roman;" class="_mt" size="1"sup style="position: relative; bottom: 0.8ex; vertical-align: baseline;" /sup/fontfont style="font-family: Times New Roman;" class="_mt" size="2"LLC/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"Eighth Avenue and 46th/fontfont style="font-family: Times New Roman;" class="_mt" size="1"sup style="position: relative; bottom: 0.8ex; vertical-align: baseline;" /sup/fontfont style="font-family: Times New Roman;" class="_mt" size="2"Street/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"font class="_mt"font style="font-family: Times New Roman;" class="_mt" size="2"50.0/font/font%(3)/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Boston Properties Office Value-Added Fund, L.P./font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"300 Billericanbsp;Road and Mountain View Research and Technology Parks/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"font class="_mt"font style="font-family: Times New Roman;" class="_mt" size="2"36.9/font/font%(1)(4)/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Annapolis Junction NFM, LLC/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"Annapolis Junction/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"font class="_mt"font style="font-family: Times New Roman;" class="_mt" size="2"50.0/font/font%(5)/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"767 Venture, LLC/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"The General Motors Building/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"font class="_mt"font style="font-family: Times New Roman;" class="_mt" size="2"60.0/font/font%/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"2 GCT Venture LLC/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"Two Grand Central Tower/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"font class="_mt"font style="font-family: Times New Roman;" class="_mt" size="2"60.0/font/font%/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"540 Madison Venture LLC/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"540 Madison Avenue/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"font class="_mt"font style="font-family: Times New Roman;" class="_mt" size="2"60.0/font/font%/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"125 West 55/fontfont style="font-family: Times New Roman;" class="_mt" size="1"sup style="position: relative; bottom: 0.8ex; vertical-align: baseline;"th /sup/fontfont style="font-family: Times New Roman;" class="_mt" size="2"Street Venture LLC/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"125 West 55/fontfont style="font-family: Times New Roman;" class="_mt" size="1"sup style="position: relative; bottom: 0.8ex; vertical-align: baseline;"th /sup/fontfont style="font-family: Times New Roman;" class="_mt" size="2"Street/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"font class="_mt"font style="font-family: Times New Roman;" class="_mt" size="2"60.0/font/font%/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"500 North Capitol /fontfont style="font-family: Times New Roman;" class="_mt" size="1"sup style="position: relative; bottom: 0.8ex; vertical-align: baseline;" /sup/fontfont style="font-family: Times New Roman;" class="_mt" size="2"LLC/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"500 North Capitol Street, NW/fontfont style="font-family: Times New Roman;" class="_mt" size="1"sup style="position: relative; bottom: 0.8ex; vertical-align: baseline;" /sup/fontfont style="font-family: Times New Roman;" class="_mt" size="2" /font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"font class="_mt"font style="font-family: Times New Roman;" class="_mt" size="2"30.0/font/font%/font/td/tr/table p style="border-bottom: #000000 0.5pt solid; line-height: 8px; margin-top: 0px; width: 10%; margin-bottom: 2px;" /p table style="border-collapse: collapse;" class="MetaData" border="0" cellspacing="0" cellpadding="0" width="100%" trtd valign="top" width="4%" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"(1)/font/td td class="MetaData" valign="top" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"The Company's economic ownership can increase based on the achievement of certain return thresholds. /font/td/tr/table table style="border-collapse: collapse;" class="MetaData" border="0" cellspacing="0" cellpadding="0" width="100%" trtd valign="top" width="4%" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"(2)/font/td td class="MetaData" valign="top" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"The Company's wholly-owned entity that owns the office component of the project owns a font class="_mt"33.3/font% interest in the entity owning the land and infrastructure of the project. /font/td/tr/table table style="border-collapse: collapse;" class="MetaData" border="0" cellspacing="0" cellpadding="0" width="100%" trtd valign="top" width="4%" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"(3)/font/td td class="MetaData" valign="top" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"This property is not in operation and consists of assembled land. /font/td/tr/table table style="border-collapse: collapse;" class="MetaData" border="0" cellspacing="0" cellpadding="0" width="100%" trtd valign="top" width="4%" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"(4)/font/td td class="MetaData" valign="top" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"Represents the Company's effective ownership interest. The Company has a font class="_mt"25.0/font% interest in the 300 Billerica Road property and a font class="_mt"39.5/font% interest in the Mountain View Research and Technology Park properties. /font/td/tr/table table style="border-collapse: collapse;" class="MetaData" border="0" cellspacing="0" cellpadding="0" width="100%" trtd valign="top" width="4%" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"(5)/font/td td class="MetaData" valign="top" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"Two of the three Annapolis Junction land parcels are undeveloped land. /font/td/tr/table/div p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"Certain of the Company's joint venture agreements include provisions whereby, at certain specified times, each partner has the right to initiate a purchase or sale of its interest in the joint ventures at an agreed upon fair value. Under these provisions, the Company is not compelled to purchase the interest of its outside joint venture partners. /font/p p style="margin-top: 12px; margin-bottom: 0px; font-size: 1px;"nbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The combined summarized financial information of the unconsolidated joint ventures is as follows (in thousands): /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p div class="MetaData" table border="0" cellspacing="0" cellpadding="0" width="100%" align="center" trtd width="78%" /td td valign="bottom" width="3%" /td td /td td /td td /td td valign="bottom" width="3%" /td td /td td /td td /td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="6" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bDecembernbsp;31,/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr trtd valign="bottom" nowrap="nowrap" p style="border-bottom: #000000 1px solid; width: 50pt;"font style="font-family: Times New Roman;" class="_mt" size="1"bBalance Sheets/b/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2010/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2009/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Real estate and development in process, net/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"5,028,851/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"5,149,868/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Other assets/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"749,308/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"760,001/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Total assets/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"5,778,159/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"5,909,869/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Mortgage and Notes payable/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"3,151,220/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"3,217,893/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Other liabilities/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"969,082/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,071,904/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Members'/Partners' equity/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,657,857/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,620,072/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Total liabilities and members'/partners' equity/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"5,778,159/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"5,909,869/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Company's share of equity/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"924,235/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"927,184/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Basis differential(1)/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(156,983/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(163,548/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Carrying value of the Company's investments in unconsolidated joint ventures/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"767,252/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"763,636/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td/tr/table p style="border-bottom: #000000 0.5pt solid; line-height: 8px; margin-top: 0px; width: 10%; margin-bottom: 2px;" /p table style="border-collapse: collapse;" class="MetaData" border="0" cellspacing="0" cellpadding="0" width="100%" trtd valign="top" width="4%" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"(1)/font/td td class="MetaData" valign="top" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"This amount represents the aggregate difference between the Company's historical cost basis and the basis reflected at the joint venture level, which is typically amortized over the life of the related assets and liabilities. Basis differentials occur from impairment of investments and upon the transfer of assets that were previously owned by the Company into a joint venture. In addition, certain acquisition, transaction and other costs may not be reflected in the net assets at the joint venture level. /font/td/tr/table/div p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p div class="MetaData" table border="0" cellspacing="0" cellpadding="0" width="100%" align="center" trtd /td td /td td /td td /td td /td td /td td /td td /td td /td td /td td /td td /td td /td/tr trtd valign="bottom" nowrap="nowrap" p style="border-bottom: #000000 1px solid; width: 86pt;"font style="font-family: Times New Roman;" class="_mt" size="1"bStatements of Operations/b/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="10" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bYear Ended Decembernbsp;31,/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2010/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2009/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2008/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" colspan="10" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b(in thousands)/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Total revenue(1)/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"607,915/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"595,533/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"363,168/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Expenses/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Operating/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"175,309/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"163,209/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"101,670/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Depreciation and amortization/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"215,533/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"232,047/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"144,712/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Total expenses/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"390,842/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"395,256/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"246,382/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd height="8" /td td height="8" colspan="4" /td td height="8" colspan="4" /td td height="8" colspan="4" /td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Operating income/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"217,073/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"200,277/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"116,786/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Other income (expense)/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Interest expense/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(235,723/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(232,978/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(139,154/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Gains (losses) from early extinguishments of debt/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"17,920/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(152/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Loss on guarantee obligation/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(3,800/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Impairment losses/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(24,568/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(40,570/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Net loss/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(4,530/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(57,269/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(63,090/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Company's share of net loss/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(5,691/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(22,197/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(30,910/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Impairment losses on investments/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(9,385/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(168,040/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Gain on sale of investment/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"572/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Basis differential/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"6,565/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"11,299/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Elimination of inter-entity interest on partner loan/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"35,328/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"32,341/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"16,932/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Income (loss) from unconsolidated joint ventures/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"36,774/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"12,058/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(182,018/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td/tr/table p style="border-bottom: #000000 0.5pt solid; line-height: 8px; margin-top: 0px; width: 10%; margin-bottom: 2px;" /p table style="border-collapse: collapse;" class="MetaData" border="0" cellspacing="0" cellpadding="0" width="100%" trtd valign="top" width="4%" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"(1)/font/td td class="MetaData" valign="top" align="left" pfont style="font-family: Times New Roman;" class="_mt" size="2"Includes straight-line rent adjustments of $font class="_mt"24.5/font million, $font class="_mt"28.0/font million and $font class="_mt"14.9/font million for the years ended Decembernbsp;31, 2010, 2009 and 2008, respectively. Includes net "above" and "below" market rent adjustments of $font class="_mt"132.1/font million, $font class="_mt"157.5/font million and $font class="_mt"91.7/font million for the years ended Decembernbsp;31, 2010, 2009 and 2008, respectively. /font/p pnbsp;/p/td/tr/table/div p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"On Marchnbsp;1, 2010, a joint venture in which the Company has a font class="_mt"60/font% interest refinanced at maturity its mortgage loan collateralized by 125 West 55th Street located in New York City. The mortgage loan totaling $font class="_mt"200.0/font million bore interest at a fixed rate of font class="_mt"5.75/font%nbsp;per annum. The new mortgage loan totaling $font class="_mt"207.0/font million bears interest at a fixed rate of font class="_mt"6.09/font%nbsp;per annum and was scheduled to mature on Marchnbsp;10, 2015. On Julynbsp;23, 2010, the joint venture modified the mortgage loan by extending the maturity date of the loan to Marchnbsp;10, 2020. All other terms of the mortgage loan remain unchanged. In connection with the new mortgage loan, the C ompany has guaranteed the joint venture's obligation to fund an escrow related to certain lease rollover costs in lieu of an initial cash deposit for the full amount. The maximum funding obligation under the guarantee was $font class="_mt"21.3/font million. At closing, the joint venture funded a $font class="_mt"10.0/font million cash deposit into the escrow account and the remaining $font class="_mt"11.3/font million will be further reduced with scheduled monthly deposits into the escrow account from operating cash flows. As of Decembernbsp;31, 2010, the maximum funding obligation under the guarantee was approximately $font class="_mt"7.2/font million. The Company earns a fee from the joint venture for providing the guarantee and has an agreement with the outside partners to reimburse the joint venture for their share of any payments made under the guarantee. In addition, on Februarynbsp;25, 2010, the joint venture repaid outstanding mezzanine loans totaling $font class="_mt"63.5/font million utilizing available cash and cash contributions from the joint venture's partners on a pro rata basis. The mezzanine loans bore interest at a weighted-average fixed rate of approximately font class="_mt"7.81/font%nbsp;per annum and were scheduled to mature on Marchnbsp;1, 2010. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"On Aprilnbsp;1, 2010, the Company acquired a font class="_mt"30/font% interest in a joint venture entity that owns 500 North Capitol Street, NW located in Washington, DC. 500 North Capitol Street is an approximatelynbsp;font class="_mt"176,000/font net rentable square foot office property that is fully-leased to a single tenant through Marchnbsp;25, 2011. On Aprilnbsp;1, 2010, the joint venture entity refinanced at maturity the mortgage loan collateralized by the property totaling approximately $font class="_mt"26.8/font million. The new mortgage loan totaling $font class="_mt"22.0/font million bears interest at a variable rate equal to the greater of (1)nbsp;the prime rate, as defined in the loan agreement, or (2)nbsp;font class="_mt"5.75/font%nbsp;per an num. The loan currently bears interest at font class="_mt"5.75/font%nbsp;per annum and matures on Marchnbsp;31, 2013. The Company's investment in the joint venture totaling approximately $font class="_mt"1.9/font million was financed with cash contributions to the venture totaling approximately $font class="_mt"1.4/font million and the issuance to the seller ofnbsp;font class="_mt"5,906/font OP Units. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"On Aprilnbsp;9, 2010, a joint venture in which the Company has a font class="_mt"60/font% interest refinanced its mortgage loan collateralized by Two Grand Central Tower located in New York City. The previous mortgage loan totaling $font class="_mt"190.0/font million bore interest at a fixed rate of font class="_mt"5.10/font%nbsp;per annum and was scheduled to mature on Julynbsp;11, 2010. The new mortgage loan totaling $font class="_mt"180.0/font million bears interest at a fixed rate of font class="_mt"6.00/font%nbsp;per annum and matures on Aprilnbsp;10, 2015. In connection with the refinancing, the joint venture repaid $font class="_mt"10.0/font million of the previous mortgage loan utilizing cash contributions from the joint venture's partners on a pro rata basis. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"On Aprilnbsp;16, 2010, a joint venture in which the Company has a font class="_mt"51/font% interest refinanced its mortgage loan collateralized by Metropolitan Square located in Washington, DC. The previous mortgage loan totaling approximately $font class="_mt"123.6/font million bore interest at a fixed rate of font class="_mt"8.23/font%nbsp;per annum and was scheduled to mature on Maynbsp;1, 2010. The new mortgage loan totaling $font class="_mt"175.0/font million bears interest at a fixed rate of font class="_mt"5.75/font%nbsp;per annum and matures on Maynbsp;5, 2020. On Aprilnbsp;26, 2010, the joint venture distributed excess loan proceeds to the partners totaling approximately $font class="_mt"49.0/font million, of which the Company's share w as approximately $font class="_mt"25.0/font million. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"On Junenbsp;15, 2010, a joint venture in which the Company has a font class="_mt"50/font% interest repaid the mortgage loan collateralized by land parcels at its site at Eighth Avenue and 46th Street in New York City utilizing cash contributions from the joint venture's partners on a pro rata basis. In addition, the joint venture completed an exchange of land parcels with a third party and received land parcels and development rights valued at approximately $font class="_mt"6.4/font million in exchange for a land parcel valued at approximately $font class="_mt"5.4/font million and cash of approximately $font class="_mt"1.0/font million. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"On Septembernbsp;12, 2010, a joint venture in which the Company has a font class="_mt"50/font% interest exercised its right to extend the maturity date of its mortgage loan collateralized by Annapolis Junction located in Annapolis, Maryland. The mortgage loan totaling $font class="_mt"42.7/font million now matures on Septembernbsp;12, 2011 and bears interest at a variable rate equal to LIBOR plus font class="_mt"1.00/font%nbsp;per annum. The mortgage loan includes an additional one-year extension option, subject to certain conditions. All other terms of the mortgage loan remain unchanged. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"On Septembernbsp;20, 2010, a joint venture in which the Company has a font class="_mt"50/font% interest refinanced its mortgage loan collateralized by Market Square North located in Washington, DC. The previous mortgage loan totaling approximately $font class="_mt"81.1/font million bore interest at a fixed rate of font class="_mt"7.70/font%nbsp;per annum and was scheduled to mature on Decembernbsp;19, 2010. The new mortgage loan totaling $font class="_mt"130.0/font million bears interest at a fixed rate of font class="_mt"4.85/font%nbsp;per annum and matures on Octobernbsp;1, 2020. On Octobernbsp;22, 2010, the joint venture distributed excess loan proceeds to the partners totaling approximately $font class="_mt"40.8/font million, of which the Co mpany's share was approximately $font class="_mt"20.4/font million. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/pfont class="_mt" size="1" /font p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"On Octobernbsp;21, 2010, the Company's Value-Added Fund conveyed the fee simple title to its One and Two Circle Star Way properties and paid $font class="_mt"3.8/font million to the lender in satisfaction of its outstanding obligations under the existing mortgage loan and guarantee. The Company's Value-Added Fund recognized a net gain on early extinguishment of debt totaling approximately $font class="_mt"17.9/font million. The Company had previously recognized impairment losses on its investment in the Value-Added Fund. The mortgage loan had an outstanding principal amount of $font class="_mt"42.0/font million, bore interest at a fixed rate of font class="_mt"6.57/font%nbsp;per annum and was scheduled to mature on Septembernbsp;1, 2013. /font/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font size="2" class="_mt" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"On Decembernbsp;23, 2010, the Company sold its font class="_mt"5.0/font% equity interest in its unconsolidated joint venture entity that owned the retail portion of the Wisconsin Place mixed-use property for approximately $font class="_mt"1.4/font million of cash, resulting in the recognition of a gain of approximately $font class="_mt"0.6/font million, which amount is included within income (loss) from unconsolidated joint ventures within the Company's Consolidated Statements of Operations. /font/p/div p style="margin-top: 0px; margin-bottom: 0px;" /pnbsp;/div/div/div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div div /div /div

Mortgage Notes Payable	12 Months Ended
Mortgage Notes Payable	Dec. 31, 2010
Notes to Financial Statements
Mortgage Notes Payable	div p style="margin-top: 0px; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"b6.nbsp;nbsp;nbsp;nbsp;Mortgage Notes Payable /b/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The Company had outstanding mortgage notes payable totaling approximately $font class="_mt"3.0/font billion and $font class="_mt"2.6/font billion as of Decembernbsp;31, 2010 and 2009, respectively, each collateralized bynbsp;font class="_mt"one/font or more buildings and related land included in real estate assets. The mortgage notes payable are generally due in monthly installments and mature at various dates through Augustnbsp;1, 2021. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"Fixed rate mortgage notes payable totaled approximately $font class="_mt"2.7/font billion and $font class="_mt"2.2/font billion at Decembernbsp;31, 2010 and 2009, respectively, with contractual interest rates ranging from font class="_mt"5.55/font% to font class="_mt"7.75/font%nbsp;per annum at Decembernbsp;31, 2010 and font class="_mt"5.55/font% to font class="_mt"8.13/font%nbsp;per annum at Decembernbsp;31, 2009 (with weighted-averages of font class="_mt"6.18/font% and font class="_mt"6.45/font% at Decembernbsp;31, 2010 and 2009, respectively). /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"Variable rate mortgage notes payable (including construction loans payable) totaled approximately $font class="_mt"317.5/font million and $font class="_mt"393.4/font million at Decembernbsp;31, 2010 and 2009, respectively, with interest rates ranging from font class="_mt"0.30/font% to font class="_mt"2.20/font% above the London Interbank Offered Rate ("LIBOR")/Eurodollar at Decembernbsp;31, 2010 and ranging from font class="_mt"1.00/font% to font class="_mt"3.85/font% above LIBOR at Decembernbsp;31, 2009. As of Decembernbsp;31, 2010 and 2009, the LIBOR rate was font class="_mt"0.26/font% and font class="_mt"0.23/font%, respectively. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"On Junenbsp;15, 2010, the Company used available cash to repay the mortgage loan collateralized by its Eight Cambridge Center property located in Cambridge, Massachusetts totaling approximately $font class="_mt"22.6/font million. The mortgage loan bore interest at a fixed rate of font class="_mt"7.73/font%nbsp;per annum and was scheduled to mature on Julynbsp;15, 2010. There was no prepayment penalty. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"On Julynbsp;1, 2010, the Company used available cash to repay the mortgage loans collateralized by its 202, 206nbsp;amp; 214 Carnegie Center properties located in Princeton, New Jersey totaling approximately $font class="_mt"55.8/font million. The mortgage loans bore interest at a fixed rate of font class="_mt"8.13/font%nbsp;per annum and were scheduled to mature on Octobernbsp;1, 2010. There were no prepayment penalties. /font/p p style="margin-top: 12px; margin-bottom: 0px; font-size: 1px;"nbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"On Augustnbsp;1, 2010, the Company modified the mortgage loan collateralized by its Reservoir Place property located in Waltham, Massachusetts. The mortgage loan totaling $font class="_mt"50.0/font million bore interest at a variable rate equal to LIBOR plus font class="_mt"3.85/font%nbsp;per annum and matures on Julynbsp;30, 2014. The modification reduced the interest rate to a variable rate equal to Eurodollar plus font class="_mt"2.20/font%nbsp;per annum. All other terms of the mortgage loan remain unchanged. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"On Septembernbsp;24, 2010, in connection with the acquisition of 510 Madison Avenue in New York City, the Company assumed the mortgage loan totaling approximately $font class="_mt"202.6/font million and at closing caused the assignment of the mortgage to a new lender and subsequently increased the amount borrowed to $font class="_mt"267.5/font million. This amount is fully secured by cash deposits included within "Cash Held in Escrows" in the Company's Consolidated Balance Sheets. The mortgage financing bears interest at a variable rate equal to LIBOR plus font class="_mt"0.30/font%nbsp;per annum and matures on Februarynbsp;24, 2012. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"On Octobernbsp;1, 2010, the Company modified its construction loan facility collateralized by its Atlantic Wharf development project in Boston, Massachusetts. The construction loan facility bears interest at a variable rate equal to LIBOR plus font class="_mt"3.00/font%nbsp;per annum and matures on Aprilnbsp;21, 2012 with font class="_mt"two/font, font class="_mt"one/font-year extension options, subject to certain conditions. The modification consisted of releasing from collateral the residential component and ground floor retail included in the "Russia Building" and reducing the loan commitment from $font class="_mt"215.0/font million to $font class="_mt"192.5/font million. All other terms of the mortgage loan remain unchanged.nbsp;font class="_mt"The Company ha s not drawn any amounts under the facility./font /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"On Octobernbsp;20, 2010, the Company used available cash to repay the mortgage loan collateralized by its South of Market property located in Reston, Virginia totaling approximately $font class="_mt"188.0/font million. The mortgage loan bore interest at a variable rate equal to LIBOR plus font class="_mt"1.00/font%nbsp;per annum and was scheduled to mature on Novembernbsp;21, 2010. There was no prepayment penalty. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"On Octobernbsp;20, 2010, the Company used available cash to repay the mortgage loan collateralized by its Democracy Tower property located in Reston, Virginia totaling approximately $font class="_mt"59.8/font million. The mortgage loan bore interest at a variable rate equal to LIBOR plus font class="_mt"1.75/font%nbsp;per annum and was scheduled to mature on Decembernbsp;19, 2010. There was no prepayment penalty. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"On Novembernbsp;1, 2010, the Company used available cash to repay the mortgage loan collateralized by its 10nbsp;amp;nbsp;20 Burlington Mall Road property located in Burlington, Massachusetts and 91 Hartwell Avenue property located in Lexington, Massachusetts totaling approximately $font class="_mt"32.8/font million. The mortgage loan bore interest at a fixed rate of font class="_mt"7.25/font%nbsp;per annum and was scheduled to mature on Octobernbsp;1, 2011. The Company paid a prepayment penalty totaling approximately $font class="_mt"0.3/font million associated with the repayment. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"On Novembernbsp;1, 2010, the Company used available cash to repay the mortgage loan collateralized by its 1330 Connecticut Avenue property located in Washington, DC totaling approximately $font class="_mt"45.0/font million. The mortgage loan bore interest at a fixed rate of font class="_mt"7.58/font%nbsp;per annum and was scheduled to mature on Februarynbsp;26, 2011. There was no prepayment penalty. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/pfont class="_mt" size="1" /font p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"On Decembernbsp;23, 2010, the Company used available cash to repay the mortgage loan collateralized by its Wisconsin Place Office property totaling approximately $font class="_mt"97.2/font million. The mortgage loan bore interest at a variable rate equal to LIBOR plus font class="_mt"1.10/font%nbsp;per annum and was scheduled to mature on Januarynbsp;29, 2011. There was no prepayment penalty./font/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"On Decembernbsp;29, 2010, in connection with the Company's acquisition of the John Hancock Tower and Garage in Boston, Massachusetts, the Company assumed the mortgage loan collateralized by the property totaling approximately $font class="_mt"640.5/font million. The assumed debt is a securitized senior mortgage loan that requires interest-only payments with a balloon payment due at maturity. Pursuant to the provisions of ASC 805, the assumed mortgage loan, which bears contractual interest at a fixed rate of font class="_mt"5.68/font%nbsp;per annum and matures on Januarynbsp;6, 2017, was recorded at its fair value of approximately $font class="_mt"663.4/font million using an effective interest rate of font class="_mt"5.00/font%nbsp;per annum. /font/p p style="margin-top: 12px; margin-bottom: 0px; font-size: 1px;"nbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"font class="_mt"font style="font-family: Times New Roman;" class="_mt" size="2"Six /font/fontmortgage loans totaling approximately $font class="_mt"883.4/font million at Decembernbsp;31, 2010 andnbsp;font class="_mt"six/font mortgage loans totaling approximately $font class="_mt"295.0/font million at Decembernbsp;31, 2009 have been accounted for at their fair values on the date the mortgage loans were assumed. The impact of recording the mortgage loans at fair value resulted in a decrease to interest expense of $font class="_mt"3.8/font million, $font class="_mt"4.1/font million and $font class="_mt"4.3/font million for the years ended Decembernbsp;31, 2010, 2009 and 2008, respectively. The cumulative liability related to t he fair value adjustments was $font class="_mt"27.7/font million and $font class="_mt"9.1/font million at Decembernbsp;31, 2010 and 2009, respectively, and is included in mortgage notes payable in the Consolidated Balance Sheets. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"Contractual aggregate principal payments of mortgage notes payable at Decembernbsp;31, 2010 are as follows: /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p table border="0" cellspacing="0" cellpadding="0" width="80%" align="center" trtd width="79%" /td td valign="bottom" width="11%" /td td /td td /td td /td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bPrincipalnbsp;Payments/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b(innbsp;thousands)/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"2011/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"471,818/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"2012/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"372,929/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"2013/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"101,289/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"2014/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"125,264/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"2015/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"14,312/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Thereafter/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,934,278/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Total aggregate principal payments/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"3,019,890/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Unamortized balance of historical fair value adjustments/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"27,696/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Total carrying value of mortgage notes payable/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"3,047,586/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td/tr/table /div

Unsecured Senior Notes	12 Months Ended
Unsecured Senior Notes	Dec. 31, 2010
Notes to Financial Statements
Unsecured Senior Notes	div p style="margin-top: 0px; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"b7.nbsp;nbsp;nbsp;nbsp;Unsecured Senior Notes /b/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The following summarizes the unsecured senior notes outstanding as of Decembernbsp;31, 2010 (dollars in thousands): /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p table border="0" cellspacing="0" cellpadding="0" width="100%" align="center" trtd width="53%" /td td valign="bottom" width="4%" /td td /td td /td td /td td valign="bottom" width="4%" /td td /td td /td td /td td valign="bottom" width="4%" /td td /td td /td td /td td valign="bottom" width="4%" /td td /td td /td td /td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bCoupon/br /Statednbsp;Rate/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bEffectivebr /Rate(1)/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bPrincipalbr /Amount/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bMaturity Date(2)/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"10 Year Unsecured Senior Notes/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"6.250/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"6.381/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"182,432/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"January 15,nbsp;2013/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"10 Year Unsecured Senior Notes/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"6.250/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"6.291/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"42,568/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"Januarynbsp;15,nbsp;2013/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"12 Year Unsecured Senior Notes/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"5.625/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"5.693/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"300,000/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"April 15, 2015/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"12 Year Unsecured Senior Notes/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"5.000/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"5.194/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"250,000/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"June 1, 2015/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"10 Year Unsecured Senior Notes/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"5.875/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"5.967/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"700,000/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"Octobernbsp;15,nbsp;2019/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"10 Year Unsecured Senior Notes/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"5.625/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"5.708/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"700,000/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"Novembernbsp;15,nbsp;2020/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"10 Year Unsecured Senior Notes/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"4.125/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"4.289/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"850,000/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"Maynbsp;15,nbsp;2021/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Total principal/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"3,025,000/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Net unamortized discount/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(8,402/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Total/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"3,016,598/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr/table p style="border-bottom: #000000 0.5pt solid; line-height: 8px; margin-top: 0px; width: 10%; margin-bottom: 2px;" /p table style="border-collapse: collapse;" class="MetaData" border="0" cellspacing="0" cellpadding="0" width="100%" trtd valign="top" width="4%" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"(1)/font/td td class="MetaData" valign="top" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"Yield on issuance date including the effects of discounts on the notes. /font/td/tr/table table style="border-collapse: collapse;" class="MetaData" border="0" cellspacing="0" cellpadding="0" width="100%" trtd valign="top" width="4%" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"(2)/font/td td class="MetaData" valign="top" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"No principal amounts are due prior to maturity. /font/td/tr/table p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"On Aprilnbsp;19, 2010, the Company's Operating Partnership completed a public offering of $font class="_mt"700.0/font million in aggregate principal amount of its font class="_mt"5.625/font% senior notes due 2020. The notes were priced at font class="_mt"99.891/font% of the principal amount to yield font class="_mt"5.708/font% to maturity. The aggregate net proceeds to the Operating Partnership, after deducting underwriter discounts and offering expenses, were approximately $font class="_mt"693.5/font million. The notes mature on Novembernbsp;15, 2020, unless earlier redeemed.nbsp;font style="font-family: Times New Roman;" class="_mt" size="2"On Aprilnbsp;7, 2010, in connection with the offering, the Company entered intonbsp;font class="_mt"two/f ont treasury lock agreements to fix the font class="_mt"10/font-year U.S. Treasury rate (which was used as a reference security in pricing) at font class="_mt"3.873/font%nbsp;per annum on notional amounts aggregating $font class="_mt"350.0/font million. /fontThe Company subsequently cash-settled the treasury lock agreements and received approximately $font class="_mt"0.4/font million, which amount will be recognized as a reduction to the Company's interest expense over the term of the notes. /font/p p style="margin-top: 12px; margin-bottom: 0px; font-size: 1px;"nbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"On Novembernbsp;18, 2010, the Company's Operating Partnership completed a public offering of $font class="_mt"850.0/font million in aggregate principal amount of its font class="_mt"4.125/font% senior notes due 2021. The notes were priced at font class="_mt"99.26/font% of the principal amount to yield font class="_mt"4.289/font% to maturity. The aggregate net proceeds to the Operating Partnership, after deducting underwriter discounts and offering expenses, were approximately $font class="_mt"836.9/font million. The notes mature on Maynbsp;15, 2021, unless earlier redeemed. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"On Decembernbsp;12, 2010, the Company's Operating Partnership completed the redemption of $font class="_mt"700.0/font million in aggregate principal amount of its font class="_mt"6.25/font% senior notes due 2013. The redemption price was determined in accordance with the applicable indenture and was approximately $font class="_mt"793.1/font million. The redemption price included approximately $font class="_mt"17.9/font million of accrued and unpaid interest to, but not including, the redemption date. Excluding such accrued and unpaid interest, the redemption price was approximately font class="_mt"110.75/font% of the principal amount being redeemed. In addition, on Novembernbsp;29, 2010, the Company entered intonbsp;font class="_mt"two/font treasury lock agree ments to fix the yield on the U.S. Treasury issue used in determining the redemption price on notional amounts aggregating $font class="_mt"700.0/font million. On Decembernbsp;9, 2010, the Company cash-settled the treasury lock agreements and paid approximately $font class="_mt"2.1/font million. As a result of the payment of the redemption premium, the settlement of the treasury locks and the write-off of deferred financing costs, the Company recognized an aggregate loss on early extinguishment of debt of approximately $font class="_mt"79.3/font million. Following the partial redemption, there is an aggregate of $font class="_mt"225.0/font million of the notes outstanding. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The indenture relating to the unsecured senior notes contains certain financial restrictions and requirements, including (1)nbsp;a leverage ratio not to exceed font class="_mt"60/font%, (2)nbsp;a secured debt leverage ratio not to exceed font class="_mt"50/font%, (3)nbsp;an interest coverage ratio of greater than font class="_mt"1.50/font, and (4)nbsp;an unencumbered asset value of not less than font class="_mt"150/font% of unsecured debt. At Decembernbsp;31, 2010 and 2009, the Company was in compliance with each of these financial restrictions and requirements. /font/p /div

Unsecured Exchangeable Senior Notes	12 Months Ended
Unsecured Exchangeable Senior Notes	Dec. 31, 2010
Notes to Financial Statements
Unsecured Exchangeable Senior Notes	div font style="font-family: Times New Roman;" class="_mt" size="2" /font divfont style="font-family: Times New Roman;" class="_mt" size="2" /font divfont style="font-family: Times New Roman;" class="_mt" size="2" /font div p style="margin-top: 0px; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"b8.nbsp;nbsp;nbsp;nbsp;Unsecured Exchangeable Senior Notes /b/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The following summarizes the unsecured exchangeable senior notes outstanding as of Decembernbsp;31, 2010 (dollars in thousands): /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p table border="0" cellspacing="0" cellpadding="0" width="100%" align="center" trtd width="33%" /td td valign="bottom" width="2%" /td td /td td /td td /td td valign="bottom" width="2%" /td td /td td /td td /td td valign="bottom" width="2%" /td td /td td /td td /td td valign="bottom" width="2%" /td td /td td /td td /td td valign="bottom" width="2%" /td td /td td /td td /td td valign="bottom" width="2%" /td td /td td /td td /td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bCoupon/br /Statednbsp;Rate/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bEffectivebr /Rate(1)/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bExchangebr /Rate/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bPrincipalbr /Amount/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bFirstnbsp;Optionalbr /Redemptionnbsp;Datenbsp;bybr /Company/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bMaturity Date/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"3.625% Exchangeable Senior Notes/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"3.625/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"4.037/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"8.5051/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"(2)nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"747,500/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="center"font style="font-family: Times New Roman;" class="_mt" size="2"N/A/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="center"font style="font-family: Times New Roman;" class="_mt" size="2"Februarynbsp;15,nbsp;2014/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"2.875% Exchangeable Senior Notes/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"2.875/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"3.462/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"7.0430/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"(3)nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"626,194/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" nowrap="nowrap" align="center"font style="font-family: Times New Roman;" class="_mt" size="2"Februarynbsp;20,nbsp;2012(4)/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="center"font style="font-family: Times New Roman;" class="_mt" size="2"February 15, 2037/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"3.750% Exchangeable Senior Notes/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"3.750/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"3.787/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"10.0066/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"(5)nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"450,000/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="center"font style="font-family: Times New Roman;" class="_mt" size="2"Maynbsp;18,nbsp;2013(6)/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="center"font style="font-family: Times New Roman;" class="_mt" size="2"May 15, 2036/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Total principal/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,823,694/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Net unamortized discount/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(8,249/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Adjustmentnbsp;fornbsp;thenbsp;equity component allocation, net of accumulated amortization/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(93,628/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Total/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,721,817/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr/table p style="border-bottom: #000000 0.5pt solid; line-height: 8px; margin-top: 0px; width: 10%; margin-bottom: 2px;" /p table style="border-collapse: collapse;" class="MetaData" border="0" cellspacing="0" cellpadding="0" width="100%" trtd valign="top" width="4%" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"(1)/font/td td class="MetaData" valign="top" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"Yield on issuance date including the effects of discounts on the notes but excluding the effects of the adjustment for the equity component allocation. /font/td/tr/table table style="border-collapse: collapse;" class="MetaData" border="0" cellspacing="0" cellpadding="0" width="100%" trtd valign="top" width="4%" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"(2)/font/td td class="MetaData" valign="top" align="left" p align="left"font style="font-family: Times New Roman;" class="_mt" size="2"The initial exchange rate isnbsp;font class="_mt"8.5051/font shares per $font class="_mt"1,000/font principal amount of the notes (or an initial exchange price of approximately $font class="_mt"117.58/font per share of Boston Properties, Inc.'s common stock). In addition, the Company entered into capped call transactions with affiliates of certain of the initial purchasers, which are intended to reduce the potential dilution upon future exchange of the notes. The capped call transactions were intended to increase the effective exchange price to the Company of the notes from $font class="_mt"117.58/font to approximately $font class="_mt"137.17/font per share (subject to adjustment), representing an overall effective premium of approximately font class="_mt"40/font% over the closing price on Augustnbsp;13, 2008 of $font class="_mt"97.98/font per share of Boston Properties, Inc.'s common stock. The net cost of the capped call transactions was approximately $font class="_mt"44.4/font million. As of Decembernbsp;31, 2010, the effective exchange price was $font class="_mt"135.85/font per share. /font/p/td/tr/table table style="border-collapse: collapse;" class="MetaData" border="0" cellspacing="0" cellpadding="0" width="100%" trtd valign="top" width="4%" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"(3)/font/td td class="MetaData" valign="top" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"In connection with the special distribution of $font class="_mt"5.98/font per share of Boston Properties, Inc.'s common stock declared on Decembernbsp;17, 2007, the exchange rate was adjusted fromnbsp;font class="_mt"6.6090/font tonbsp;font class="_mt"7.0430/font shares per $font class="_mt"1,000/font principal amount of notes effective as of Decembernbsp;31, 2007, resulting in an exchange price of approximately $font class="_mt"141.98/font per share of Boston Properties, Inc.'s common stock. /font/td/tr/table table style="border-collapse: collapse;" class="MetaData" border="0" cellspacing="0" cellpadding="0" width="100%" trtd valign="top" width="4%" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"(4)/font/td td class="MetaData" valign="top" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"Holders may require the Operating Partnership to repurchase the notes for cash on Februarynbsp;15, 2012, 2017, 2022, 2027 and 2032 and at any time prior to their maturity upon a fundamental change, in each case at a price equal to font class="_mt"100/font% of the principal amount of the notes being repurchased plus any accrued and unpaid interest up to, but excluding, the repurchase date. /font/td/tr/table table style="border-collapse: collapse;" class="MetaData" border="0" cellspacing="0" cellpadding="0" width="100%" trtd valign="top" width="4%" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"(5)/font/td td class="MetaData" valign="top" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"In connection with the special distribution of $font class="_mt"5.98/font per share of Boston Properties, Inc.'s common stock declared on Decembernbsp;17, 2007, the exchange rate was adjusted fromnbsp;font class="_mt"9.3900/font tonbsp;font class="_mt"10.0066/font shares per $font class="_mt"1,000/font principal amount of notes effective as of Decembernbsp;31, 2007, resulting in an exchange price of approximately $font class="_mt"99.93/font per share of Boston Properties, Inc.'s common stock. /font/td/tr/table table style="border-collapse: collapse;" class="MetaData" border="0" cellspacing="0" cellpadding="0" width="100%" trtd valign="top" width="4%" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"(6)/font/td td class="MetaData" valign="top" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"Holders may require the Operating Partnership to repurchase the notes for cash on Maynbsp;18, 2013 and Maynbsp;15, 2016, 2021, 2026 and 2031 and at any time prior to their maturity upon a fundamental change, in each case at a price equal to font class="_mt"100/font% of the principal amount of the notes being repurchased plus any accrued and unpaid interest up to, but excluding, the repurchase date. /font/td/tr/table p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"ASC 470-20 (formerly known as FSP No. APB 14-1) requires the liability and equity components of convertible debt instruments that may be settled in cash upon conversion (including partial cash settlement) to be separately accounted for in a manner that reflects the issuer's nonconvertible debt borrowing rate. ASC 470-20 requires that the initial proceeds from the sale of the Operating Partnership's $font class="_mt"862.5/font million of font class="_mt"2.875/font% exchangeable senior notes due 2037, $font class="_mt"450.0/font million of font class="_mt"3.75/font% exchangeable senior notes due 2036 and $font class="_mt"747.5/font million of font class="_mt"3.625/font% exchangeable senior notes due 2014 be allocated between a liability component and an equity component in a m anner that reflects interest expense at the interest rate of similar nonconvertible debt that could have been issued by the Operating Partnership at such time. The Company measured the fair value of the debt components of the font class="_mt"2.875/font%, font class="_mt"3.75/font% and font class="_mt"3.625/font% exchangeable senior notes for the periods presented based on effective interest rates of font class="_mt"5.630/font%, font class="_mt"5.958/font% and font class="_mt"6.555/font%, respectively. The aggregate carrying amount of the debt component was approximately $font class="_mt"1.72/font billion and $font class="_mt"1.90/font billion (net of the ASC 470-20 adjustment of approximately $font class="_mt"93.6/font million and $font class="_mt"140.4/font million) at Decembernbsp;31, 2010 and Decembernbsp;31, 2009, respectively. As a resu lt, the Company attributed an aggregate of approximately $font class="_mt"230.3/font million of the proceeds to the equity component of the notes, which represents the excess proceeds received over the fair value of the notes at the date of issuance. The equity component of the notes has been reflected within Additional Paid-in Capital in the Consolidated Balance Sheets. The Company reclassified approximately $font class="_mt"1.0/font million of deferred financing costs to Additional Paid-in Capital, which represented the costs attributable to the equity components of the notes. The carrying amount of the equity component was approximately $font class="_mt"228.8/font million and $font class="_mt"229.3/font million at Decembernbsp;31, 2010 and Decembernbsp;31, 2009, respectively. The resulting debt discount will be amortized over the period during which the debt is expected to be outstanding (i.e., through the first optional redemption dates or, in the case of the 2014 notes, the maturity date) as additional non-cash interest expense. The additional non-cash interest expense attributable to each debt security will increase in subsequent reporting periods through the first optional redemption date (or, in the case of the 2014 notes, the maturity date) as the debt accretes to its par value over the same period. The aggregate contractual interest expense was approximately $font class="_mt"69.0/font million, $font class="_mt"74.4/font million and $font class="_mt"56.4/font million for the years ended Decembernbsp;31, 2010, 2009 and 2008, respectively. As a result of applying ASC 470-20, the Company reported additional non-cash interest expense of approximately $font class="_mt"38.3/font million, $font class="_mt"38.6/font million and $font class="_mt"27.8/font million for the years ended Decembernbsp;31, 2010, 2009 and 2008, respectively. ASC 470-20 requires companies to retrospectively apply the requirements of the pronouncement to all periods presented. As a result, the revised diluted earnings per share reflect a reduction of $font class="_mt"0.16/font for the year ended Decembernbsp;31, 2008. /font/p p style="margin-top: 12px; margin-bottom: 0px; font-size: 1px;"nbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"During the year ended Decembernbsp;31, 2010, the Company's Operating Partnership repurchased approximately $font class="_mt"236.3/font million aggregate principal amount of its font class="_mt"2.875/font% exchangeable senior notes due 2037, which the holders may requi re the Operating Partnership to repurchase in February 2012, for approximately $font class="_mt"236.6/fontnbsp;million. font style="font-family: Times New Roman;" class="_mt" size="2"The repurchased notes had an aggregate allocated liability and equity value of approximately $font class="_mt"225.7/fontnbsp;million and $font class="_mt"0.4/font million, respectively, at the time of repurchase resulting in the recognition of a loss on early extinguishment of debt of approximately $font class="_mt"1 0.5/fontnbsp;million during the year ended Decembernbsp;31, 2010. There remains an aggregate of approximately $font class="_mt"626.2/font million of these notes outstanding. /font/font/p/div/div/div /div

Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Dec. 31, 2010
Notes to Financial Statements
Commitments and Contingencies	div p style="margin-top: 0px; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"b10.nbsp;nbsp;nbsp;nbsp;Commitments and Contingencies /b/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; margin-bottom: 0px; margin-left: 2%;"font style="font-family: Times New Roman;" class="_mt" size="2"iGeneral /i/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"In the normal course of business, the Company guarantees its performance of services or indemnifies third parties against its negligence. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The Company has letter of credit and performance obligations of approximately $font class="_mt"27.0/font million related to lender and development requirements. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"Certain of the Company's joint venture agreements include provisions whereby, at certain specified times, each partner has the right to initiate a purchase or sale of its interest in the joint ventures. Under these provisions, the Company is not compelled to purchase the interest of its outside joint venture partners. /font/p p style="margin-top: 12px; margin-bottom: 0px; font-size: 1px;"nbsp;/p p style="padding-bottom: 0px; margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"In connection with the assumption of the General Motors Building's secured loan by the Company's unconsolidated joint venture, 767 Venture, LLC, the Company guaranteed the unconsolidated joint venture's obligation to fund various escrows, including tenant improvements, taxes and insurance in lieu of cash deposits. As of Decembernbsp;31, 2010, the maximum funding obligation under the guarantee was approximately $font class="_mt"24.0/fontnbsp;million. The Company earns a fee from the joint venture for providing the guarantee and has an agreement with the outside partners to reimburse the joint venture for their share of any payments made under the guarantee. In connection with the refinancing of the 125 West 55/fontfont style="font-family: Times New Roman;" class="_mt" size="1"sup style="position: relativ e; bottom: 0.8ex; vertical-align: baseline;"th /sup/fontfont style="font-family: Times New Roman;" class="_mt" size="2" /fontfont style="font-family: Times New Roman;" class="_mt" size="1"sup style="position: relative; bottom: 0.8ex; vertical-align: baseline;" /sup/fontfont style="font-family: Times New Roman;" class="_mt" size="2"Street property's secured loan by the Company's unconsolidated joint venture, 125 West 55/fontfont style="font-family: Times New Roman;" class="_mt" size="1"sup style="position: relative; bottom: 0.8ex; vertical-align: baseline;"th /sup/fontfont style="font-family: Times New Roman;" class="_mt" size="2" /fontfont style="font-family: Times New Roman;" class="_mt" size="1"sup style="position: relative; bottom: 0.8ex; vertical-align: baseline;" /sup/fontfont style="font-family: Times New Roman;" class="_mt" size="2" Street Venture LLC, the Company has guaranteed the unconsolidated joint venture's obligation to fund an escrow related to certain lease rollover costs in lieu of an initial cash deposit for the full amount. The maximum funding obligation under the guarantee was $font class="_mt"21.3/font million. At closing, the joint venture funded a $font class="_mt"10.0/font million cash deposit into the escrow account and the remaining $font class="_mt"11.3/font million will be further reduced with scheduled monthly deposits into the escrow account from operating cash flows. As of Decembernbsp;31, 2010, the maximum funding obligation under the guarantee was approximately $font class="_mt"7.2/fontnbsp;million. The Company earns a fee from the joint venture for providing the guarantee and has an agreement with the outside partners to reimburse the joint venture for their share of any payments made under the guarantee. In connection with the mortgage financing collateralized by the Company's One Freedom Square property located in Reston, Virginia, the Com/fontfont style="font-family: Times New Roman;" class="_mt" size="1"sup style="position: relative; bottom: 0.8ex; vertical-align: baseline;" /sup/fontfont style="font-family: Times New Roman;" class="_mt" size="2" /fontfont style="font-family: Times New Roman;" class="_mt" size="1"sup style="position: relative; bottom: 0.8ex; vertical-align: baseline;" /sup/fontfont style="font-family: Times New Roman;" class="_mt" size="2" /fontfont style="font-family: Times New Roman;" class="_mt" size="1"sup style="position: relative; bottom: 0.8ex; vertical-align: baseline;" /sup/fontfont style="font-family: Times New Roman;" class="_mt" size="2" /fontfont style="font-family: Times New Roman;" class="_mt" size="1"sup style="position: relative; bottom: 0.8e x; vertical-align: baseline;" /sup/fontfont style="font-family: Times New Roman;" class="_mt" size="2"pany has agreed to guarantee approximately $font class="_mt"7.9/font million related to its obligation to provide funds for certain tenant re-leasing costs. From time to time, the Company (or the applicable joint venture) has also agreed to guarantee portions of the principal, interest or other amounts in connection with other unconsolidated joint venture borrowings. In addition to the financial guarantees referenced above, the Company has agreed to customary environmental indemnifications and nonrecourse carve-outs (e.g., guarantees against fraud, misrepresentation and bankruptcy) on certain of its unconsolidated joint venture loans. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; margin-bottom: 0px; margin-left: 2%;"font style="font-family: Times New Roman;" class="_mt" size="2"iConcentrations of Credit Risk /i/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"Management of the Company performs ongoing credit evaluations of tenants and may require tenants to provide some form of credit support such as corporate guarantees and/or other financial guarantees. Although the Company's properties are geographically diverse and the tenants operate in a variety of industries, to the extent the Company has a significant concentration of rental revenue from any single tenant, the inability of that tenant to make its lease payments could have an adverse effect on the Company. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; margin-bottom: 0px; margin-left: 2%;"font style="font-family: Times New Roman;" class="_mt" size="2"iSome potential losses are not covered by insurance. /i/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The Company carries insurance coverage on its properties of types and in amounts and with deductibles that it believes are in line with coverage customarily obtained by owners of similar properties. In response to the uncertainty in the insurance market following the terrorist attacks of Septembernbsp;11, 2001, the Federal Terrorism Risk Insurance Act (as amended, "TRIA") was enacted in November 2002 to require regulated insurers to make available coverage for "certified" acts of terrorism (as defined by the statute). The expiration date of TRIA was extended to Decembernbsp;31, 2014 by the Terrorism Risk Insurance Program Reauthorization Act of 2007 ("TRIPRA"). Currently, the Company's property insurance program per occurrence limits are $font class="_mt"1.0/font billion for its portfolio insurance program, including coverage for acts of terro rism certified under TRIA other than nuclear, biological, chemical or radiological terrorism ("Terrorism Coverage"). The Company currently insures certain properties, including the General Motors Building located at 767 Fifth Avenue in Newnbsp;York, New York ("767 Fifth Avenue"), in separate stand alone insurance programs. The property insurance program per occurrence limits for 767 Fifth Avenue are $font class="_mt"1.625/font billion, including Terrorism Coverage, with $font class="_mt"1.375/font billion of Terrorism Coverage in excess of $font class="_mt"250/font million being provided by NYXP, LLC ("NYXP"), as a direct insurer. The Company also currently carries nuclear, biological, chemical and radiological terrorism insurance coverage for acts of terrorism certified under TRIA ("NBCR Coverage"), which is provided by IXP, LLC ("IXP") as a direct insurer, for the properties in our portfolio, including 767 Fifth Avenue, but excluding the properties owned by the Company's Value-Added Fund and certain other properties owned in joint ventures with third parties or which we manage. The per occurrence limit for NBCR Coverage is $font class="_mt"1.0/font billion. Under TRIA, after the payment of the required deductible and coinsurance, the NBCR Coverage provided by IXP and the Terrorism Coverage provided by NYXP are backstopped by the Federal Government if the aggregate industry insured losses resulting from a certified act of terrorism exceed a "program trigger." The program trigger is $font class="_mt"100/font million andnbsp;the coinsurance is font class="_mt"15/font%. Under TRIPRA, if the Federal Government pays out for a loss under TRIA, it is mandatory that the Federal Government recoup the full amount of the loss from insurers offering TRIA coverage after the payment of the loss pursuant to a formula in TRIPRA. The Company may elect to terminate the NBCR Coverage if the Federal Government seeks recoupmen t for losses paid under TRIA, if there is a change in its portfolio or for any other reason. The Company intends to continue to monitor the scope, nature and cost of available terrorism insurance and maintain insurance in amounts and on terms that are commercially reasonable. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The Company also currently carries earthquake insurance on its properties located in areas known to be subject to earthquakes in an amount and subject to self-insurance that the Company believes are commercially reasonable. In addition, this insurance is subject to a deductible in the amount of font class="_mt"5/font% of the value of the affected property. Specifically, the Company currently carries earthquake insurance which covers its San Francisco region with a $font class="_mt"120/font million per occurrence limit and a $font class="_mt"120/font million annual aggregate limit, $font class="_mt"20/font million of which is provided by IXP, as a direct insurer. The amount of the Company's earthquake insurance coverage may not be sufficient to cover losses from earthquakes. In addition, the amount of earth quake coverage could impact the Company's ability to finance properties subject to earthquake risk. The Company may discontinue earthquake insurance on some or all of its properties in the future if the premiums exceed the Company's estimation of the value of the coverage. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"IXP, a captive insurance company which is a wholly-owned subsidiary of the Company, acts as a direct insurer with respect to a portion of the Company's earthquake insurance coverage for its Greater San Francisco properties and the Company's NBCR Coverage. NYXP, a captive insurance company which is a wholly-owned subsidiary of the Company, acts as a direct insurer with respect to a portion of the Company's Terrorism Coverage for 767 Fifth Avenue. Currently, NYXP only insures losses which exceed the program trigger under TRIA and NYXP reinsures with a third-party insurance company any coinsurance payable under TRIA. Insofar as the Company owns IXP and NYXP, it is responsible for their liquidity and capital resources, and the accounts of IXP and NYXP are part of the Company's consolidated financial statements. In particular, if a loss occurs which is covered by the Compan y's NBCR Coverage but is less than the applicable program trigger under TRIA, IXP would be responsible for the full amount of the loss without any backstop by the Federal Government. IXP and NYXP would also be responsible for any recoupment charges by the Federal Government in the event losses are paid out and their insurance policies are maintained after the payout by the Federal Government. If the Company experiences a loss and IXP or NYXP are required to pay under their insurance policies, the Company would ultimately record the loss to the extent of the required payment. Therefore, insurance coverage provided by IXP and NYXP should not be considered as the equivalent of third-party insurance, but rather as a modified form of self-insurance. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The mortgages on the Company's properties typically contain requirements concerning the financial ratings of the insurers who provide policies covering the property. The Company provides the lenders on a regular basis with the identity of the insurance companies in the Company's insurance programs. The ratings of some of the Company's insurers are below the rating requirements in some of the Company's loan agreements and the lenders for these loans could attempt to claim an event of default has occurred under the loan. The Company believes it could obtain insurance with insurers which satisfy the rating requirements. Additionally, in the future, the Company's ability to obtain debt financing secured by individual properties, or the terms of such financing, may be adversely affected if lenders generally insist on ratings for insurers which are difficult to obtain or whi ch result in a commercially unreasonable premium. There can be no assurance that a deficiency in the financial ratings of one or more of the Company's insurers will not have a material adverse effect on the Company. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The Company continues to monitor the state of the insurance market in general, and the scope and costs of coverage for acts of terrorism and California earthquake risk in particular, but the Company cannot anticipate what coverage will be available on commercially reasonable terms in future policy years. There are other types of losses, such as from wars or the presence of mold at the Company's properties, for which the Company cannot obtain insurance at all or at a reasonable cost. With respect to such losses and losses from acts of terrorism, earthquakes or other catastrophic events, if the Company experiences a loss that is uninsured or that exceeds policy limits, the Company could lose the capital invested in the damaged properties, as well as the anticipated future revenues from those properties. Depending on the specific circumstances of each affected property, i t is possible that the Company could be liable for mortgage indebtedness or other obligations related to the property. Any such loss could materially and adversely affect the Company's business and financial condition and results of operations. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; margin-bottom: 0px; margin-left: 2%;"font style="font-family: Times New Roman;" class="_mt" size="2"iLegal Matters /i/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The Company is subject to various legal proceedings and claims that arise in the ordinary course of business. These matters are generally covered by insurance. Management believes that the final outcome of such matters will not have a material adverse effect on the financial position, results of operations or liquidity of the Company. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; margin-bottom: 0px; margin-left: 2%;"font style="font-family: Times New Roman;" class="_mt" size="2"iState and Local Tax Matters /i/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"Because the Company is organized and qualifies as a REIT, it is generally not subject to federal income taxes, but is subject to certain state and local taxes. In the normal course of business, certain entities through which the Company owns real estate either have undergone, or are currently undergoing, tax audits. Although the Company believes that it has substantial arguments in favor of its positions in the ongoing audits, in some instances there is no controlling precedent or interpretive guidance on the specific point at issue. Collectively, tax deficiency notices received to date from the jurisdictions conducting the ongoing audits have not been material. However, there can be no assurance that future audits will not occur with increased frequency or that the ultimate result of such audits will not have a material adverse effect on the Company's results of opera tions. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; margin-bottom: 0px; margin-left: 2%;"font style="font-family: Times New Roman;" class="_mt" size="2"iEnvironmental Matters /i/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"It is the Company's policy to retain independent environmental consultants to conduct or update Phase I environmental assessments (which generally do not involve invasive techniques such as soil or ground water sampling) and asbestos surveys in connection with the Company's acquisition of properties. These pre-purchase environmental assessments have not revealed environmental conditions that the Company believes will have a material adverse effect on its business, assets, financial condition, results of operations or liquidity, and the Company is not otherwise aware of environmental conditions with respect to its properties that the Company believes would have such a material adverse effect. However, from time to time environmental conditions at the Company's properties have required and may in the future require environmental testing and/or regulatory filings, as well as remedial action. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"In February 1999, the Company (through a joint venture) acquired from Exxon Corporation a property in Massachusetts that was formerly used as a petroleum bulk storage and distribution facility and was known by the state regulatory authority to contain soil and groundwater contamination. The Company developed an office park on the property. The Company engaged a specially licensed environmental consultant to oversee the management of contaminated soil and groundwater that was disturbed in the course of construction. Under the property acquisition agreement, Exxon agreed to (1)nbsp;bear the liability arising from releases or discharges of oil and hazardous substances which occurred at the site prior to the Company's ownership, (2)nbsp;continue monitoring and/or remediating such releases and discharges as necessary and appropriate to comply with applicable requi rements, and (3)nbsp;indemnify the Company for certain losses arising from preexisting site conditions. Any indemnity claim may be subject to various defenses, and there can be no assurance that the amounts paid under the indemnity, if any, would be sufficient to cover the liabilities arising from any such releases and discharges. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"Environmental investigations at some of the Company's properties and certain properties owned by affiliates of the Company have identified groundwater contamination migrating from off-site source properties. In each case the Company engaged a licensed environmental consultant to perform the necessary investigations and assessments and to prepare any required submittals to the regulatory authorities. In each case the environmental consultant concluded that the properties qualify under the regulatory program or the regulatory practice for a status which eliminates certain deadlines for conducting response actions at a site. The Company also believes that these properties qualify for liability relief under certain statutory provisions or regulatory practices regarding upgradient releases. Although the Company believes that the current or former owners of the upgradient so urce properties may bear responsibility for some or all of the costs of addressing the identified groundwater contamination, the Company will take such further response actions (if any) that it deems necessary or advisable. Other than periodic testing at some of these properties, no such additional response actions are anticipated at this time. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"Some of the Company's properties and certain properties owned by the Company's affiliates are located in urban, industrial and other previously developed areas where fill or current or historical uses of the areas have caused site contamination. Accordingly, it is sometimes necessary to institute special soil and/or groundwater handling procedures and/or include particular building design features in connection with development, construction and other property operations in order to achieve regulatory closure and/or ensure that contaminated materials are addressed in an appropriate manner. In these situations it is the Company's practice to investigate the nature and extent of detected contamination and estimate the costs of required response actions and special handling procedures. The Company then uses this information as part of its decision-making process with resp ect to the acquisition and/or development of the property. For example, the Company owns a parcel in Massachusetts which was formerly used as a quarry/asphalt batching facility. Pre-purchase testing indicated that the site contained relatively low levels of certain contaminants. The Company has developed an office park on this property. Prior to and during redevelopment activities, the Company engaged a specially licensed environmental consultant to monitor environmental conditions at the site and prepare necessary regulatory submittals based on the results of an environmental risk characterization. A submittal has been made to the regulatory authorities in order to achieve regulatory closure at this site. The submittal included an environmental deed restriction that mandates compliance with certain protective measures in a portion of the site where low levels of residual soil contamination have been left in place in accordance with applicable laws. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The Company expects that resolution of the environmental matters relating to the above will not have a material impact on its business, assets, financial condition, results of operations or liquidity. However, the Company cannot assure you that it has identified all environmental liabilities at its properties, that all necessary remediation actions have been or will be undertaken at the Company's properties or that the Company will be indemnified, in full or at all, in the event that such environmental liabilities arise. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; margin-bottom: 0px; margin-left: 2%;"font style="font-family: Times New Roman;" class="_mt" size="2"iTax Protection Obligations /i/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"In connection with the acquisition or contribution ofnbsp;font class="_mt"six/font properties, the Company entered into agreements for the benefit of the selling or contributing parties which specifically state that until such time as the contributors do not hold at least a specified percentage of the OP Units owned by such person following the contribution of the properties, or untilnbsp;font class="_mt"June 2017/font fornbsp;font class="_mt"one/font of the properties, the Operating Partnership will not sell or otherwise transfer the properties in a taxable transaction. If the Company does sell or transfer the properties in a taxable transaction, it would be liable to the contributors for contractual damages. /font/p /div

Noncontrolling Interests	12 Months Ended
Noncontrolling Interests	Dec. 31, 2010
Notes to Financial Statements
Noncontrolling Interests	div font style="font-family: Times New Roman;" class="_mt" size="2" /font div divfont style="font-family: Times New Roman;" class="_mt" size="2" /font divfont style="font-family: Times New Roman;" class="_mt" size="2"font style="font-family: Times New Roman;" class="_mt" size="2" /font/font div div class="MetaData"font style="font-family: Times New Roman;" class="_mt" size="2" /font div p style="margin-top: 0px; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"b11.nbsp;nbsp;nbsp;nbsp;Noncontrolling Interests /b/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"Effective Januarynbsp;1, 2009, the Company adopted the guidance included in ASC 810 "Consolidation" ("ASCnbsp;810") (formerly known as SFAS No.nbsp;160, "Noncontrolling Interests in Consolidated Financial Statements#8212;an amendment of ARB No.nbsp;51" ("SFAS No.nbsp;160")) and ASC 480-10-S99 "Distinguishing Liabilities from Equity" ("ASC 480-10-S99") (formerly known as EITF Topic No. D-98 "Classification and Measurement of Redeemable Securities" (Amended)), under which noncontrolling interests of the Company (previously known as "minority interests") are classified either as a component of equity or in the mezzanine section of the balance sheet as temporary equity depending on the terms of such noncontrolling interests. As a result of the adoption of the guidance included in ASC 810, the Company reclassified the noncontrolling interests i n consolidated property partnerships from the mezzanine section of its Consolidated Balance Sheets to equity. The reclassification totaled approximately $font class="_mt"6.9/font million as of Decembernbsp;31, 2008. In addition, the Company reclassified the noncontrolling interests related to the common units of the Operating Partnership not owned by the Company from the mezzanine section of its Consolidated Balance Sheets to equity. The reclassification totaled approximately $font class="_mt"563.2/font million as of Decembernbsp;31, 2008. Noncontrolling interests related to redeemable preferred units of the Operating Partnership continue to be classified in the mezzanine section of the Consolidated Balance Sheets. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"Under the guidance included in ASC 810, net income encompasses the total income of all consolidated subsidiaries and there is a separate disclosure of the attribution of that income between controlling and noncontrolling interests. The implementation of this standard had no effect on the Company's results of operations. As a result of the adoption of the guidance included in ASC 810, net income attributable to noncontrolling interests is now deducted from net income in the determination of net income attributable to the Company for all periods presented. In addition, other comprehensive income (loss) attributable to noncontrolling interests is now deducted from comprehensive income in the determination of comprehensive income attributable to the Company for all periods presented. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"Noncontrolling interests relate to the interests in the Operating Partnership not owned by the Company and interests in property partnerships not wholly-owned by the Company. As of Decembernbsp;31, 2010, the noncontrolling interests consisted ofnbsp;font class="_mt"19,387,871/font OP Units,nbsp;font class="_mt"1,507,164/font LTIP Units,nbsp;font class="_mt"1,080,938/font 2008 OPP Units andnbsp;font class="_mt"1,113,044/font Series Two Preferred Units (ornbsp;font class="_mt"1,460,688/font OP Units on an as converted basis) held by parties other than the Company. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"biNoncontrolling Interest#8212;Redeemable Preferred Units of the Operating Partnership /i/b/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The Preferred Units at Decembernbsp;31, 2010 and 2009 consisted solely ofnbsp;font class="_mt"1,113,044/font Series Two Preferred Units, which bear a preferred distribution equal to the greater of (1)nbsp;the distribution which would have been paid in respect of the Series Two Preferred Unit had such Series Two Preferred Unit been converted into an OP Unit (including both regular and special distributions) or (2)nbsp;a rate ranging from font class="_mt"5.00/font% to font class="_mt"7.00/font%nbsp;per annum on a liquidation preference of $font class="_mt"50.00/font per unit, and are convertible into OP Units at a rate of $font class="_mt"38.10/font per Preferred Unit (1.312336 OP Units for each Preferred Unit). Distributions on the Series Two Preferred Units are paya ble quarterly and, unless the greater rate described in the next sentence applies, accrue at font class="_mt"7.0/font% until Maynbsp;12, 2009 and font class="_mt"6.0/font% thereafter. If distributions on the number of OP Units into which the Series Two Preferred Units are convertible are greater than distributions calculated using the rates described in the preceding sentence for the applicable quarterly period, then the greater distributions are payable instead. The holders of Series Two Preferred Units have the right to require the Operating Partnership to redeem their units for cash at the redemption price of $font class="_mt"50.00/font per unit on Maynbsp;12, 2011,nbsp;Maynbsp;14, 2012,nbsp;Maynbsp;14, 2013 and Maynbsp;12, 2014. The maximum number of units that may be required to be redeemed from all holders on each of these dates is 1,007,662, which is one-sixth of the number of Series Two Preferred Units that were origin ally issued. The holders had the right to have their Series Two Preferred Units redeemed for cash on Maynbsp;12, 2009 and Maynbsp;12, 2010, although no holder exercised such right. The Company also has the right, under certain conditions and at certain times, to redeem Series Two Preferred Units for cash and to convert into OP Units any Series Two Preferred Units that are not redeemed when they are eligible for redemption. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"On Februarynbsp;16, 2010, the Operating Partnership paid a distribution on its outstanding Series Two Preferred Units of $font class="_mt"0.75616/font per unit. On Maynbsp;17, 2010, the Operating Partnership paid a distribution on its outstanding Series Two Preferred Units of $font class="_mt"0.73151/font per unit. On Augustnbsp;16, 2010, the Operating Partnership paid a distribution on its outstanding Series Two Preferred Units of $font class="_mt"0.75616/font per unit. On Novembernbsp;15, 2010, the Operating Partnership paid a distribution on its outstanding Series Two Preferred Units of $font class="_mt"0.75616/font per unit. /font/p p style="margin-top: 12px; margin-bottom: 0px; font-size: 1px;"nbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The following table reflects the activity for noncontrolling interests#8212;redeemable preferred units for the years ended Decembernbsp;31, 2010, 2009 and 2008: /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p table border="0" cellspacing="0" cellpadding="0" width="90%" align="center" trtd width="89%" /td td valign="bottom" width="5%" /td td /td td /td td /td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Balance at Decembernbsp;31, 2007/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"55,652/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Net income/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"4,226/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Distributions/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(3,738/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Adjustments to reflect redeemable preferred units at redemption value/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(488/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Balance at Decembernbsp;31, 2008/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"55,652/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Net income/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"3,594/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Distributions/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(3,594/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Balance at Decembernbsp;31, 2009/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"55,652/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Net income/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"3,343/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Distributions/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(3,343/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Balance at Decembernbsp;31, 2010/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"55,652/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td/tr/table p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"biNoncontrolling Interest#8212;Common Units of the Operating Partnership /i/b/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"During the years ended Decembernbsp;31, 2010 and 2009,nbsp;font class="_mt"591,900/font andnbsp;font class="_mt"138,856/font OP Units, respectively, were presented by the holders for redemption and were redeemed by the Company in exchange for an equal number of shares of Common Stock. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"At Decembernbsp;31, 2010, the Company had outstandingnbsp;font class="_mt"1,080,938/font 2008 OPP Units. Prior to the measurement date on Februarynbsp;5, 2011, 2008 OPP Units will be entitled to receive per unit distributions equal to one-tenth (10%)nbsp;of the regular quarterly distributions payable on an OP Unit, but will not be entitled to receive any special distributions. After the measurement date, the number of 2008 OPP Units, both vested and unvested, which 2008 OPP award recipients have earned, if any, based on the establishment of an outperformance pool, will be entitled to receive distributions in an amount per unit equal to distributions, both regular and special, payable on an OP Unit. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"On Januarynbsp;29, 2010, the Operating Partnership paid a distribution on the OP Units and LTIP Units in the amount of $font class="_mt"0.50/font per unit and a distribution on the 2008 OPP Units in the amount of $font class="_mt"0.05/font per unit to holders of record as of the close of business on Decembernbsp;31, 2009. On Aprilnbsp;30, 2010, the Operating Partnership paid a distribution on the OP Units and LTIP Units in the amount of $font class="_mt"0.50/font per unit and a distribution on the 2008 OPP Units in the amount of $font class="_mt"0.05/font per unit to holders of record as of the close of business on Marchnbsp;31, 2010. On Julynbsp;30, 2010, the Operating Partnership paid a distribution on the OP Units and LTIP Units in the amount of $font class="_mt"0.50 /font per unit and a distribution on the 2008 OPP Units in the amount of $font class="_mt"0.05/font per unit to holders of record as of the close of business on Junenbsp;30, 2010. On Octobernbsp;29, 2010, the Operating Partnership paid a distribution on the OP Units and LTIP Units in the amount of $font class="_mt"0.50/font per unit and a distribution on the 2008 OPP Units in the amount of $font class="_mt"0.05/font per unit to holders of record as of the close of business on Septembernbsp;30, 2010. On Decembernbsp;20, 2010, Boston Properties, Inc., as general partner of the Operating Partnership, declared a distribution on the OP Units and LTIP Units in the amount of $font class="_mt"0.50/font per unit and a distribution on the 2008 OPP Units in the amount of $font class="_mt"0.05/font per unit, in each case payable on Januarynbsp;28, 2011 to holders of record as of the close of business on December amp;nbsp;31, 2010. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The Series Two Preferred Units may be converted into OP Units at the election of the holder thereof at any time. A holder of an OP Unit may present such OP Unit to the Operating Partnership for redemption at any time (subject to restrictions agreed upon at the time of issuance of OP Units to particular holders that may restrict such redemption right for a period of time, generally one year from issuance). Upon presentation of an OP Unit for redemption, the Operating Partnership must redeem such OP Unit for cash equal to the then value of a share of common stock of the Company. The Company may, in its sole discretion, elect to assume and satisfy the redemption obligation by paying either cash or issuing one share of Common Stock. The value of the OP Units (not owned by the Company and including LTIP Units assuming that all conditions have been met for the conversion the reof) and Series Two Preferred Units (on an as converted basis) had all of such units been redeemed at Decembernbsp;31, 2010 was approximately $font class="_mt"1.80/font billion and $font class="_mt"125.8/font million, respectively, based on the closing price of the Company's common stock of $font class="_mt"86.10/font per share on Decembernbsp;31, 2010. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"biNoncontrolling Interest#8212;Property Partnerships /i/b/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The noncontrolling interests in property partnerships consist of the outside equity interests in joint ventures that are consolidated with the financial results of the Company because the Company exercises control over the entities that own the properties. The equity interests in these ventures that are not owned by the Company, totaling approximately $font class="_mt"(0.6)/font million and $font class="_mt"5.7/font million at Decembernbsp;31, 2010 and Decembernbsp;31, 2009, respectively. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"On Decembernbsp;23, 2010, the Company acquired the outside member's font class="_mt"33.3/font% equity interest in its consolidated joint venture entity thatnbsp;font style="font-family: Times New Roman;" class="_mt" size="2"owns the Wisconsin Place Office property located/font in Chevy Chase, Maryland for cash of approximately $font class="_mt"25.5/font million. The acquisition was accounted for as an equity transaction in accordance with ASC 810. The difference between the purchase price and the carrying value of the outside member's equity interest, totaling approximately $font class="_mt"19.1/font million, reduced additional paid-in capital in the Company's Consolidated Balance Sheets. /font/p/div/div/div/div/div/div /div /us-gaap:MinorityInterestDisclosureTextBlock> ock>

Earnings Per Share	12 Months Ended
Earnings Per Share	Dec. 31, 2010
Notes to Financial Statements
Earnings Per Share	div p style="margin-top: 0px; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"b15.nbsp;nbsp;nbsp;nbsp;Earnings Per Share /b/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/pfont size="2" class="_mt" /font p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"Earnings per share ("EPS") has been computed pursuant to the provisions of ASC 260-10 "Earnings Per Share" ("ASC 260-10"). During 2004, the Company adopted the guidance included in ASC 260-10 (formerly known as EITF 03-6 "Participating Securities and the Two-Class Method under FASB 128" ("EITF 03-6")), which provides further guidance on the definition of participating securities. Pursuant to the guidance included in ASC 260-10, the Operating Partnership's Series Two Preferred Units, which are reflected as Noncontrolling Interests#8212;Redeemable Preferred Units of the Operating Partnership in the Company's Consolidated Balance Sheets, are considered participating securities and are included in the computation of basic and diluted earnings per share of the Company if the effect of applying the if-converted method is dilutive. The terms of the Series Two Preferred U nits enable the holders to obtain OP Units of the Operating Partnership, as well as Common Stock of the Company.nbsp;In Junenbsp;2008, the FASB issued guidance included in ASC 260-10 (formerly known as FSP EITF 03-6-1, "Determining Whether Instruments Granted in Share-Based Payment Transactions are Participating Securities" ("FSP EITF 03-6-1")). The guidance included in ASC 260-10 clarifies that unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities and shall be included in the computation of EPS pursuant to the two-class method.nbsp;The guidance included in ASC 260-10 requires the retrospective adjustment of all prior-period EPS data presented (including interim financial statements, summaries of earnings, and selected financial data) to conform with the provisions of the guidance. Early application was not permitted.nbsp;As a result, the Company's unvested restricted stock, LTIP U nits and 2008 OPP Units are considered participating securities and are included in the computation of basic and diluted earnings per share of the Company if the effect of applying the if-converted method is dilutive.nbsp;The adoption of the guidance included in ASC 260-10 on Januarynbsp;1, 2009 did not have a material impact on the Company's computation of EPS. Because the 2008 OPP Units require the Company to outperform absolute and relative return thresholds, unless such thresholds have been met by the end of the applicable reporting period, the Company excludes the 2008 OPP Units from the diluted EPS calculation. For the years ended Decembernbsp;31, 2010, 2009 and 2008, the absolute and relative return thresholds for the 2008 OPP Units were not met and as a result the 2008 OPP Units have been excluded from the diluted EPS calculation (See Note 20). Other potentially dilutive common shares, including stock options, restricted stock and other securities of the Operating Partnership that are exchangeable for the Company's Common Stock, and the related impact on earnings, are considered when calculating diluted EPS. The following table provides a reconciliation of both the net income attributable to Boston Properties, Inc. and the number of common shares used in the computation of basic EPS, which is calculated by dividing net income attributable to Boston Properties, Inc. by the weighted-average number of common shares outstanding during the period. /font/p div class="MetaData" p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font class="_mt" size="1" /font/p table border="0" cellspacing="0" cellpadding="0" width="100%" align="center" trtd /td td /td td /td td /td td /td td /td td /td td /td td /td td /td td /td td /td td /td/tr trtd valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="10" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bFor the year ended Decembernbsp;31, 2010/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bIncomebr /(Numerator)/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bSharesbr /(Denominator)/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bPerbr /Sharebr /Amount/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" colspan="10" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b(innbsp;thousands,nbsp;exceptnbsp;fornbsp;pernbsp;sharenbsp;amounts)/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Basic Earnings:/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Net income attributable to Boston Properties, Inc./font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"159,072/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"139,440/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1.14/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Effect of Dilutive Securities:/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Stock Based Compensation/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"617/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(0.00/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Diluted Earnings:/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Net income/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"159,072/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"140,057/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1.14/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td/tr/table div table border="0" cellspacing="0" cellpadding="0" width="100%" align="center" trtd width="68%"nbsp;/td td valign="bottom" width="5%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td valign="bottom" width="5%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td valign="bottom" width="5%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td/tr trtd valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="10" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bFor the year ended Decembernbsp;31, 2009/b/font/td td valign="bottom"nbsp;/td/tr trtd valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bIncomebr /(Numerator)/b/font/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bSharesbr /(Denominator)/b/font/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bPerbr /Sharebr /Amount/b/font/td td valign="bottom"nbsp;/td/tr trtd valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" colspan="10" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b(innbsp;thousands,nbsp;exceptnbsp;fornbsp;pernbsp;sharenbsp;amounts)/b/font/td td valign="bottom"nbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Basic Earnings:/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Net income attributable to Boston Properties, Inc./font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"231,014/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"131,050/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1.76/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Effect of Dilutive Securities:/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Stock Based Compensation/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"462/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(0.00/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Diluted Earnings:/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td/tr tr style="font-size: 1px;"td valign="bottom"nbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Net income/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"231,014/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"131,512/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1.76/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom"nbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td/tr/table p style="margin-top: 0px; margin-bottom: 0px;"nbsp;/p table border="0" cellspacing="0" cellpadding="0" width="100%" align="center" trtd width="68%"nbsp;/td td valign="bottom" width="5%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td valign="bottom" width="5%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td valign="bottom" width="5%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td/tr trtd valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="10" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bFor the year ended Decembernbsp;31, 2008/b/font/td td valign="bottom"nbsp;/td/tr trtd valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bIncomebr /(Numerator)/b/font/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bSharesbr /(Denominator)/b/font/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bPerbr /Sharebr /Amount/b/font/td td valign="bottom"nbsp;/td/tr trtd valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" colspan="10" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b(innbsp;thousands,nbsp;exceptnbsp;fornbsp;pernbsp;sharenbsp;amounts)/b/font/td td valign="bottom"nbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Basic Earnings:/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Net income attributable to Boston Properties, Inc./font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"105,270/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"119,980/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"0.88/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Effect of Dilutive Securities:/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Stock Based Compensation/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,319/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(0.01/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Diluted Earnings:/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td/tr tr style="font-size: 1px;"td valign="bottom"nbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Net income/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"105,270/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"121,299/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"0.87/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr/table/div/div /div

Employee Benefit Plans	12 Months Ended
Employee Benefit Plans	Dec. 31, 2010
Notes to Financial Statements
Employee Benefit Plans	<font style="font-family: Times New Roman;" class="_mt" size="2"> </font> <div> <p style="margin-top: 0px; margin-bottom: 0px;"><font style="font-family: Times New Roman;" class="_mt" size="2"><b>16. Employee Benefit Plans </b></font></p> <p style="margin-top: 0px; margin-bottom: -6px;"><font class="_mt" size="1"> </font> </p> <p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"><font style="font-family: Times New Roman;" class="_mt" size="2">Effective January 1, 1985, the predecessor of the Company adopted a 401(k) Savings Plan (the "Plan") for its employees. Under the Plan, as amended, employees, as defined, are eligible to participate in the Plan after they have completed <font class="_mt">three</font> months of service. Upon formation, the Company adopted the Plan and the terms of the Plan. </font></p> <p style="margin-top: 0px; margin-bottom: 0px;"><font class="_mt" size="1"> </font> </p> <p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"><font style="font-family: Times New Roman;" class="_mt" size="2">Effective January 1, 2000, the Company amended the Plan by increasing the Company's matching contribution to <font class="_mt">200</font>% of the first <font class="_mt">3</font>% from <font class="_mt">200</font>% of the first <font class="_mt">2</font>% of participant's eligible earnings contributed (utilizing earnings that are not in excess of an amount established by the IRS ($<font class="_mt">245,000</font>, $<font class="_mt">245,000</font> and $<font class="_mt">230,000</font> in 2010, 2009 and 2008, respectively), indexed for inflation) and by eliminating the vesting requirement. The Company's aggregate matching contribution for the years ended December 31, 2010, 2009 and 2008 was $<font class="_mt">2.9</font> million, $<font class="_mt">3.0 lt;/font million and $font class="_mt"2.7/font million, respectively. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"Effective Januarynbsp;1, 2001, the Company amended the Plan to provide a supplemental retirement contribution to employees who have at leastnbsp;font class="_mt"ten/font years of service on Januarynbsp;1, 2001, and who arenbsp;font class="_mt"40/font years of age or older as of Januarynbsp;1, 2001. The maximum supplemental retirement contribution will not exceed the annual limit on contributions established by the Internal Revenue Service. The Company will record an annual supplemental retirement credit for the benefit of each participant. The Company's supplemental retirement contribution and credit for the years ended Decembernbsp;31, 2010, 2009 and 2008 was $font class="_mt"48,000/font, $font class="_mt"122,000/font and $font class="_mt"210,000/font, respect ively. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The Company also maintains a deferred compensation plan that is designed to allow officers of the Company to defer a portion of their current income on a pre-tax basis and receive a tax-deferred return on these deferrals. The Company's obligation under the plan is that of an unsecured promise to pay the deferred compensation to the plan participants in the future. At Decembernbsp;31, 2010 and 2009, the Company has funded approximately $font class="_mt"8.7/font million and $font class="_mt"9.9/font million, respectively, into a separate account, which is not restricted as to its use. The Company's liability under the plan is equal to the total amount of compensation deferred by the plan participants and earnings on the deferred compensation pursuant to investments elected by the plan participants. The Company's liability as of Decemb ernbsp;31, 2010 and 2009 was $font class="_mt"8.7/font million and $font class="_mt"9.8/font million, respectively, which are included in the accompanying Consolidated Balance Sheets. /font/p/div

Stock Option and Incentive Plan and Stock Purchase Plan	12 Months Ended
Stock Option and Incentive Plan and Stock Purchase Plan	Dec. 31, 2010
Notes to Financial Statements
Stock Option and Incentive Plan and Stock Purchase Plan	div font style="font-family: Times New Roman;" class="_mt" size="2" /font divfont style="font-family: Times New Roman;" class="_mt" size="2" /font div div class="MetaData"font style="font-family: Times New Roman;" class="_mt" size="2" /font div p style="margin-top: 0px; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"b17.nbsp;nbsp;nbsp;nbsp;Stock Option and Incentive Plan and Stock Purchase Plan /b/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The Company has established a stock option and incentive plan for the purpose of attracting and retaining qualified employees and rewarding them for superior performance in achieving the Company's business goals and enhancing stockholder value. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"Under the Company's 1997 Stock Option and Incentive Plan (the "1997 Plan"), the number of shares of Common Stock available for issuance wasnbsp;font class="_mt"4,019,174/font shares. At Decembernbsp;31, 2010, the number of shares available for issuance under the plan was font class="_mt"1,575,669/font, of which a maximum ofnbsp;font class="_mt"1,122,204/font shares may be granted as awards other than stock options. The 1997 Plan expires on Maynbsp;15, 2017. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p div class="MetaData" p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"On Januarynbsp;24, 2008, the Compensation Committee (the "Committee") of the Board of Directors (the "Board") of the Company approved outperformance awards under the 1997 Plan to officers and key employees of the Company. These awards (the "2008 OPP Awards") were part of a broad-based, long-term incentive compensation program designed to provide the Company's management team at several levels within the organization with the potential to earn equity awards subject to the Company "outperforming" and creating shareholder value in a pay-for-performance structure. 2008 OPP Awards utilize total return to shareholders ("TRS") over a font class="_mt"three/font-year measurement period as the performance metric and includenbsp;font class="_mt"two/font years of time-based vesting after the end of the performance measurement period (subje ct to acceleration in certain events) as a retention tool. Recipients of 2008 OPP Awards were eligible to share in an outperformance pool if the Company's TRS, including both share appreciation and dividends, exceeds absolute and relative hurdles over a font class="_mt"three/font-year measurement period fromnbsp;font class="_mt"Februarynbsp;5, 2008/font to font class="_mt"Februarynbsp;5, 2011/font, based on the average closing price of a share of the Company's common stock (a "REIT Share") of $font class="_mt"92.8240/font for thenbsp;font class="_mt"five/font trading days prior to and including Februarynbsp;5, 2008. The aggregate reward that recipients of all 2008 OPP Awards could earn, as measured by the outperformance pool, was subject to a maximum cap of $font class="_mt"110/font million, although only awards for an aggregate of up to approximately $font class="_mt"104.8/fon tnbsp;million were granted. Prior to the measurement date, 2008 OPP Units were entitled to receive per unit distributions equal to one-tenth (font class="_mt"10/font%)nbsp;of the regular quarterly distributions payable on an OP Unit, but were not entitled to receive any special distributions (See Note 20). /font/p/div p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The Company issued font class="_mt"69,499/font,nbsp;font class="_mt"62,876/font andnbsp;font class="_mt"4,723/font shares of restricted stock and font class="_mt"252,597/font,nbsp;font class="_mt"515,007/font andnbsp;font class="_mt"288,507/font LTIP Units to employees and directors under the 1997 Plan during the years ended Decembernbsp;31, 2010, 2009 and 2008, respectively. The Company issuednbsp;font class="_mt"1,085,861/font 2008 OPP Units under the 1997 Plan during the year ended Decembernbsp;31, 2008. Employees paid $font class="_mt"0.01/font per share of restricted common stock and $font class="_mt"0.25/font per LTIP and 2008 OPP Unit. An LTIP Unit is generally the economic equivalent o f a share of restricted stock in the Company. The aggregate value of the LTIP Units is included in Noncontrolling Interests in the Consolidated Balance Sheets. The restricted stock and LTIP Units granted to employees between Januarynbsp;1, 2004 and October 2006 vest over a font class="_mt"five/font-year term. Grants of restricted stock and LTIP Units made on and after Novembernbsp;2006 vest innbsp;font class="_mt"four/font equal annual installments. Restricted stock and LTIP Units are measured at fair value on the date of grant based on the number of shares or units granted, as adjusted for forfeitures, and the price of the Company's Common Stock on the date of grant as quoted on the New York Stock Exchange. Such value is recognized as an expense ratably over the corresponding employee service period. As the 2008 OPP Awards are subject to both a service condition and a market condition, the Company recognizes the compensation expense related to the 2008 OPP Awar ds under the graded vesting attribution method. Under the graded vesting attribution method, each portion of the award that vests at a different date is accounted for as a separate award and recognized over the period appropriate to that portion so that the compensation cost for each portion should be recognized in full by the time that portion vests. Dividends paid on both vested and unvested shares of restricted stock are charged directly to Earnings in Excess of Dividends in the Consolidated Balance Sheets. Stock-based compensation expense associated with restricted stock, LTIP Units and 2008 OPP Units was approximately $font class="_mt"31.9/font million, $font class="_mt"25.6/font million and $font class="_mt"22.1/font million for the years ended Decembernbsp;31, 2010, 2009 and 2008, respectively. For the year ended Decembernbsp;31, 2010, stock-based compensation expense includes an aggregate of approximately $font class="_mt"5.8/font gt; million of remaining previously unvested stock-based compensation granted between 2006 and 2009 to Edward H. Linde, the Company's former Chief Executive Officer, which expense was accelerated as a result of his passing on Januarynbsp;10, 2010. At Decembernbsp;31, 2010, there was $font class="_mt"27.7/font million of unrecognized compensation expense related to unvested restricted stock and LTIP Units and $font class="_mt"4.4/font million of unrecognized compensation expense related to unvested 2008 OPP Units that is expected to be recognized over a weighted-average period of approximatelynbsp;font class="_mt"2.0/font years. Upon the conclusion of the font class="_mt"three/font-year measurement period on Februarynbsp;5, 2011, the 2008 OPP Awards were not earned, and therefore the program was terminated, which resulted in the Company accelerating the remaining unrecognized compensation expense totaling approximately $fo nt class="_mt"4.3/font million during the first quarter of 2011. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The shares of restricted stock were valued at approximately $font class="_mt"4.5/font million ($font class="_mt"65.31/font per share weighted-average), $font class="_mt"2.8/font million ($font class="_mt"43.89/font per share weighted-average) and $font class="_mt"0.5/font million ($font class="_mt"96.09/font per share weighted-average) for the years ended Decembernbsp;31, 2010, 2009 and 2008, respectively. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"LTIP Units were valued using a Monte Carlo simulation method model in accordance with the provisions of ASC 718 "Compensation#8212;Stock Compensation" ("ASC 718") (formerly SFAS No.nbsp;123R). LTIP Units issued during the years ended Decembernbsp;31, 2010, 2009 and 2008 were valued at approximately $font class="_mt"15.3/font million, $font class="_mt"21.1/font million and $font class="_mt"25.4/font million, respectively. The weighted-average per unit fair value of LTIP Unit grants in 2010, 2009 and 2008 was $font class="_mt"60.49/font, $font class="_mt"41.05/font and $font class="_mt"88.08/font, respectively. The per unit fair value of each LTIP Unit granted in 2010, 2009 and 2008 was estimated on the date of grant using the following assumptions; an expected life ofnbsp;font class="_mt"5.7/font years,nbsp;font class="_mt"5.6/font years andnbsp;font class="_mt"5.6/font years, a risk-free interest rate of font class="_mt"2.60/font%, font class="_mt"1.87/font% and font class="_mt"2.75/font% and an expected price volatility of font class="_mt"36.0/font%, font class="_mt"40.0/font% and font class="_mt"25.0/font%, respectively. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The 2008 OPP Units were valued at approximately $font class="_mt"19.7/font million utilizing a Monte Carlo simulation to estimate the probability of the performance vesting conditions being satisfied.nbsp;font class="_mt"The Monte Carlo simulation used a statistical formula underlying the Black-Scholes and binomial formulas and such simulation was run approximatelynbsp;font class="_mt"100,000/font times./font For each simulation, the payoff is calculated at the settlement date, which is then discounted to the award date at a risk-free interest rate. The average of the values over all simulations is the expected value of the unit on the award date. Assumptions used in the valuations included (1)nbsp;factors associated with the underlying performance of the Company's stock price and total shareholder return o ver the term of the performance awards including total stock return volatility and risk-free interest and (2)nbsp;factors associated with the relative performance of the Company's stock price and total shareholder return when compared to the SNL Equity REIT Index. The valuation was performed in a risk-neutral framework, so no assumption was made with respect to an equity risk premium. The fair value of the 2008 OPP Units is based on the sum of: (1)nbsp;the present value of the expected payoff to the OPP Award on the measurement date, if the TRS over the applicable measurement period exceeds performance hurdles of the Absolute and the Relative Components; and (2)nbsp;the present value of the distributions payable on the 2008 OPP Units. The ultimate reward realized on account of the OPP Award by the holders of the 2008 OPP Units is contingent on the TRS achieved on the measurement date, both in absolute terms and relative to the TRS of the SNL Equity REIT Index. The per unit fair value of each 2 008 OPP Unit was estimated on the date of grant using the following assumptions in the Monte-Carlo valuation: expected price volatility for the Company and the SNL Equity REIT index of font class="_mt"25/font% and font class="_mt"20/font%, respectively; a risk free rate of font class="_mt"2.08/font%; and estimated total dividend payments over the measurement period of $font class="_mt"8.23/font per share. /font/p p style="margin-top: 12px; margin-bottom: 0px; font-size: 1px;"nbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"A summary of the status of the Company's stock options as of Decembernbsp;31, 2010, 2009 and 2008 and changes during the years ended Decembernbsp;31, 2010, 2009 and 2008 are presented below: /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p table border="0" cellspacing="0" cellpadding="0" width="90%" align="center" trtd width="76%" /td td valign="bottom" width="5%" /td td /td td /td td /td td valign="bottom" width="4%" /td td /td td /td td /td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bShares/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bWeightedbr /Averagebr /Exercisebr /Price/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Outstanding at Decembernbsp;31, 2007/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"2,264,535/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"35.22/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Granted/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Exercised/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(1,058,133/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"36.36/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Canceled/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Outstanding at Decembernbsp;31, 2008/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,206,402/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"34.23/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Granted/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Exercised/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(242,507/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"33.41/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Canceled/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Outstanding at Decembernbsp;31, 2009/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"963,895/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"34.44/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Granted/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Exercised/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(638,957/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"35.35/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Canceled/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Outstanding at Decembernbsp;31, 2010/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"324,938/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"32.65/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td/tr/table p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The following table summarizes information about stock options outstanding at Decembernbsp;31, 2010: /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p table border="0" cellspacing="0" cellpadding="0" width="100%" align="center" trtd width="25%" /td td valign="bottom" width="9%" /td td /td td /td td /td td valign="bottom" width="9%" /td td /td td /td td /td td valign="bottom" width="9%" /td td /td td /td td /td td valign="bottom" width="9%" /td td /td td /td td /td td valign="bottom" width="9%" /td td /td td /td td /td/tr trtd style="border-bottom: #000000 1px solid;" valign="bottom" colspan="12" nowrap="nowrap" align="center" p style="margin-top: 0px; margin-bottom: 1px;" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bOptions Outstanding/b/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="6" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bOptions Exercisable/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr trtd valign="bottom" nowrap="nowrap" align="center" p style="margin-top: 0px; margin-bottom: 0px;" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bRangenbsp;ofnbsp;Exercise/b/font/p p style="border-bottom: #000000 1px solid; margin-top: 0px; width: 61pt; margin-bottom: 1px;" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bPrices/b/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" nowrap="nowrap" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bNumberbr /Outstandingnbsp;atbr /12/31/10/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" nowrap="nowrap" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bWeighted-Averagebr /Remainingbr /Contractual Life/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" nowrap="nowrap" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bWeighted-Averagebr /Exercise Price/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" nowrap="nowrap" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bNumbernbsp;Exercisablebr /at 12/31/10/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" nowrap="nowrap" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bWeighted-Averagebr /Exercise Price/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="bottom" align="center"font style="font-family: Times New Roman;" class="_mt" size="2"$font class="_mt"32.62/font-$font class="_mt"34.14/font/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"324,938/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1.1nbsp;Years/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"32.65/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"324,938/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"32.65/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr/table p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The total intrinsic value of the outstanding and exercisable stock options as of Decembernbsp;31, 2010 was approximately $font class="_mt"17.4/font million. In addition, the Company hadnbsp;font class="_mt"963,895/font andnbsp;font class="_mt"1,206,402/font options exercisable at weighted-average exercise prices of $font class="_mt"34.44/font and $font class="_mt"34.23/font at Decembernbsp;31, 2009 and 2008, respectively. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The Company adopted the 1999 Non-Qualified Employee Stock Purchase Plan (the "Stock Purchase Plan") to encourage the ownership of Common Stock by eligible employees. The Stock Purchase Plan became effective on Januarynbsp;1, 1999 with an aggregate maximum ofnbsp;font class="_mt"250,000/font shares of Common Stock available for issuance. The Stock Purchase Plan provides for eligible employees to purchase on the business day immediately following the end of the biannual purchase periods (i.e., Januarynbsp;1-Junenbsp;30 and Julynbsp;1-Decembernbsp;31) shares of Common Stock at a purchase price equal to font class="_mt"85/font% of the average closing prices of the Common Stock during the lastnbsp;font class="_mt"ten/font business days of the purchase period. The Company issued font class ="_mt"9,131/font,nbsp;font class="_mt"12,105/font andnbsp;font class="_mt"7,755/font shares with the weighted average purchase price equal to $font class="_mt"61.61/font per share, $font class="_mt"42.65/font per share and $font class="_mt"80.80/font per share under the Stock Purchase Plan during the years ended Decembernbsp;31, 2010, 2009 and 2008, respectively. /font/p/div/div/div/div /div

Summary of Significant Accounting Policies (Policy)

12 Months Ended

Dec. 31, 2010

Notes to Financial Statements

Reclassification and Adoption of New Accounting Pronouncements

div div class="MetaData" p style="margin-top: 0px; margin-bottom: 0px; margin-left: 2%;"font style="font-family: Times New Roman;" class="_mt" size="2"iReclassifications and Adoption of New Accounting Pronouncements /i/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"Certain prior year amounts have been reclassified to conform to the current year presentation. In addition, certain prior year amounts have been revised as a result of the adoption on Januarynbsp;1, 2009 of (1)nbsp;Accounting Standards Codification ("ASC") 470-20 "Debt with Conversion and Other Options" ("ASC 470-20") (formerly known as FASB Staff Position ("FSP") No. APB 14-1 "Accounting for Convertible Debt Instruments That May Be Settled in Cash upon Conversion (Including Partial Cash Settlement)" ("FSP No. APB 14-1")) (See Note 8), (2)nbsp;the guidance included in ASC 810 "Consolidation" ("ASC 810") (formerly known as SFAS No.nbsp;160, "Noncontrolling Interests in Consolidated Financial Statements#8212;an amendment of ARB No.nbsp;51" ("SFAS No.nbsp;160")) and ASC 480-10-S99 "Distinguishing Liabilities from Equity" ("ASC 480-10-S99 ") (formerly known as EITF Topic No. D-98 "Classification and Measurement of Redeemable Securities" (Amended)) (See Note 11) and (3)nbsp;the guidance included in ASC 260-10 "Earnings Per Share" ("ASC 260-10") (formerly known as FSP EITF 03-06-1, "Determining Whether Instruments Granted in Share-Based Payment Transactions are Participating Securities" ("FSP EITF 03-06-1")) (See Note 15). /font/p/div /div

Cash and Cash Equivalents

div div class="MetaData" p style="margin-top: 0px; margin-bottom: 0px; margin-left: 2%;"font style="font-family: Times New Roman;" class="_mt" size="2"iCash and Cash Equivalents /i/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"Cash and cash equivalents consist of cash on hand and investments with maturities of three months or less from the date of purchase. The majority of the Company's cash and cash equivalents are held at major commercial banks which may at times exceed the Federal Deposit Insurance Corporation limit of $font class="_mt"250,000/font. The Company has not experienced any losses to date on its invested cash. /font/p/div /div

Investment in Securities

div div class="MetaData" div p style="margin-top: 0px; margin-bottom: 0px; margin-left: 2%;"font style="font-family: Times New Roman;" class="_mt" size="2"iInvestment in Securities /i/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The Company accounts for investments in trading securities atnbsp;fair value, with gains or losses resulting from changes in fair value recognized currently in earnings. The designation of trading securities is generally determined at acquisition. The Company maintains a deferred compensation plan that is designed to allow officers of the Company to defer a portion of their current income on a pre-tax basis and receive a tax-deferred return on these deferrals. The Company's obligation under the plan is that of an unsecured promise to pay the deferred compensation to the plan participants in the future. At Decembernbsp;31, 2010 and 2009, the Company has funded approximately $font class="_mt"8.7/font million and $font class="_mt"9.9/font million, respectively, into a separate account, which is not restricted as to its use. The Co mpany recognized gains (losses) of approximately $font class="_mt"0.9/font million, $font class="_mt"2.2/font million and $font class="_mt"(3.2)/font million on its investments in the account associated with the Company's deferred compensation plan during the years ended Decembernbsp;31, 2010, 2009 and 2008, respectively. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"During the years ended Decembernbsp;31, 2009 and 2008, investment in securities is comprised of an investment in an unregistered money market fund and investments in an account associated with the Company's deferred compensation plan (See Note 16). In December 2007, the unregistered money market fund suspended cash redemptions by investors; investors could elect in-kind redemptions of the underlying securities or maintain their investment in the fund and receive distributions as the underlying securities matured or were liquidated by the fund sponsor. As a result, the Company retained this investment for a longer term than originally intended, and the valuation of the Company's investment was subject to changes in market conditions. Because interests in this fund were valued at less than their $font class="_mt"1.00/font par value, the Company recog nized gains (losses) of approximately $font class="_mt"0.2/font million and $font class="_mt"(1.4)/font million on its investment during the years ended Decembernbsp;31, 2009 and 2008, respectively. As of Decembernbsp;31, 2009, the Company no longer had investments in this unregistered money market fund. /font/p/div/div /div

Deferred Charges

div div class="MetaData" p style="margin-top: 0px; margin-bottom: 0px; margin-left: 2%;"font style="font-family: Times New Roman;" class="_mt" size="2"iDeferred Charges /i/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"Deferred charges include leasing costs and financing fees. Leasing costs include an allocation for acquired intangible in-place lease values and direct and incremental fees and costs incurred in the successful negotiation of leases, including brokerage, legal, internal leasing employee salaries and other costs which have been deferred and are being amortized on a straight-line basis over the terms of the respective leases. Internal leasing salaries and related costs capitalized for the years ended Decembernbsp;31, 2010, 2009 and 2008 were $font class="_mt"5.4/font million, $font class="_mt"3.3/font million and $font class="_mt"4.4/font million, respectively. External fees and costs incurred to obtain long-term financing have been deferred and are being amortized over the terms of the respective loans on a basis that approximates the effective interest method and are included with interest expense. Unamortized financing and leasing costs are charged to expense upon the early repayment or significant modification of the financing or upon the early termination of the lease, respectively. Fully amortized deferred charges are removed from the books upon the expiration of the lease or maturity of the debt. /font/p/div /div

Investments in Unconsolidated Joint Ventures

div div class="MetaData" p style="margin-top: 0px; margin-bottom: 0px; margin-left: 2%;"font style="font-family: Times New Roman;" class="_mt" size="2"iInvestments in Unconsolidated Joint Ventures /i/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"Except for ownership interests in variable interest entities for which the Company is the primary beneficiary, the Company accounts for its investments in joint ventures under the equity method of accounting because it exercises significant influence over, but does not control, these entities. The Company's judgment with respect to its level of influence or control of an entity and whether it is the primary beneficiary of a variable interest entity involves the consideration of various factors including the form of the Company's ownership interest, its representation in the entity's governance, the size of its investment (including loans), estimates of future cash flows, its ability to participate in policy making decisions and the rights of the other investors to participate in the decision making process and to replace the Company as manager and/or liquidate the vent ure, if applicable. The Company's assessment of its influence or control over an entity affects the presentation of these investments in the Company's consolidated financial statements. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/pfont class="_mt" size="1" /font p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"These investments are recorded initially at cost, as Investments in Unconsolidated Joint Ventures, and subsequently adjusted for equity in earnings and cash contributions and distributions. Any difference between the carrying amount of these investments on the balance sheet and the underlying equity in net assets is amortized as an adjustment to equity in earnings of unconsolidated joint ventures over the life of the related asset. Under the equity method of accounting, the net equity investment of the Company is reflected within the Consolidated Balance Sheets, and the Company's share of net income or loss from the joint ventures is included within the Consolidated Statements of Operations. The joint venture agreements may designate different percentage allocations among investors for profits and losses, however, the Company's recognition of joint venture income or lo ss generally follows the joint venture's distribution priorities, which may change upon the achievement of certain investment return thresholds. The Company may account for cash distributions in excess of its investment in an unconsolidated joint venture as income when the Company is not the general partner in a limited partnership and when the Company has neither the requirement nor the intent to provide financial support to the joint venture.nbsp;For ownership interests in variable interest entities, the Company consolidates those in which it is the primary beneficiary. The Company's investments in unconsolidated joint ventures are reviewed for impairment periodically and the Company records impairment charges when events or circumstances change indicating that a decline in the fair values below the carrying values has occurred and such decline is other-than-temporary. The ultimate realization of the investment in unconsolidated joint ventures is dependent on a number of factors, including the perform ance of each investment and market conditions. The Company will record an impairment charge if it determines that a decline in the value below the carrying value of an investment in an unconsolidated joint venture is other than temporary./font/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"To the extent that the Company contributes assets to a joint venture, the Company's investment in the joint venture is recorded at the Company's cost basis in the assets that were contributed to the joint venture. To the extent that the Company's cost basis is different than the basis reflected at the joint venture level, the basis difference is amortized over the life of the related asset and included in the Company's share of equity in net income of the joint venture. In accordance with the provisions of ASC 970-323 "Investments#8212;Equity Method and Joint Ventures" ("ASC 970-323") (formerly Statement of Position 78-9 "Accounting for Investments in Real Estate Ventures" ("SOP 78-9")), the Company will recognize gains on the contribution of real estate to joint ventures, relating solely to the outside partner's interest, to the extent the economic substance of t he transaction is a sale. /font/p/div /div

Equity Offering Costs

div div class="MetaData" p style="margin-top: 0px; margin-bottom: 0px; margin-left: 2%;"font style="font-family: Times New Roman;" class="_mt" size="2"iEquity Offering Costs /i/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"Underwriting commissions and offering costs have been reflected as a reduction of additional paid-in capital. /font/p/div /div

Dividends

Dividends

Earnings and profits, which determine the taxability of dividends to stockholders, will differ from income reported for financial reporting purposes due to the differences for federal income tax purposes in the treatment of gains on the sale of real property, revenue and expense recognition, compensation expense, and in the estimated useful lives and basis used to compute depreciation.

The tax treatment of common dividends per share for federal income tax purposes is as follows:


	For the year ended December 31,
	2010					2009					2008
	Per Share		%			Per Share		%			Per Share			%
Ordinary income	$	1.17		58.39	%	$	2.15		90.93	%	$	2.55			51.83	%
Return of capital		0.83		41.61	%		0.21		9.07	%		2.37			48.17	%

Total	$	2.00		100.00	%	$	2.36		100.00	%	$	4.92	(1)		100.00	%

(1)	Includes the special dividend of $5.98 per common share paid on January 30, 2008 of which approximately $3.40 per common share was allocable to 2007 and approximately $2.58 was allocable to 2008.

Earnings Per Share

div div class="MetaData"font style="font-family: Times New Roman;" class="_mt" size="2" /font div p style="margin-top: 0px; margin-bottom: 0px; margin-left: 2%;"font style="font-family: Times New Roman;" class="_mt" size="2"iEarnings Per Share /i/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"Basic earnings per share ("EPS") is computed by dividing net income available to common shareholders, as adjusted for unallocated earnings (if any) of certain securities issued by the Operating Partnership, by the weighted average number of shares of Common Stock outstanding during the year. Diluted EPS reflects the potential dilution that could occur from shares issuable in connection with awards under stock-based compensation plans, including upon the exercise of stock options, and conversion of the noncontrolling interests in the Operating Partnership./font/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2" /fontnbsp;/p/div/div /div

Fair Value of Financial Instruments

div p style="margin-top: 0px; margin-bottom: 0px; margin-left: 2%;"font style="font-family: Times New Roman;" class="_mt" size="2"iFair Value of Financial Instruments /i/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The carrying values of cash and cash equivalents, marketable securities, escrows, receivables, accounts payable, accrued expenses and other assets and liabilities are reasonable estimates of their fair values because of the short maturities of these instruments. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"In Aprilnbsp;2009, the FASB issued ASC 825-10-65nbsp;"Transition Related to FSP FAS 107-1 and APB 28-1, Interim Disclosures about Fair Value of Financial Instruments" ("ASC 825-10-65") (formerly known as FSP No.nbsp;FAS 107-1 and APB 28-1, "Interim Disclosures about Fair Value of Financial Instruments" ("FSP No. FAS 107-1")). ASC 825-10-65 requires disclosures about fair-value of financial instruments for interim reporting periods of publicly-traded companies as well as in annual financial statements. ASC 825-10-65 requires those disclosures in summarized financial information at interim reporting periods. ASC 825-10-65 was effective for interim reporting periods ending after Junenbsp;15, 2009, with early adoption permitted for periods ending after Marchnbsp;15, 2009. For purposes of financial reporting disclosures, the Company calculates the f air value of mortgage notes payable, unsecured senior notes and unsecured exchangeable senior notes. The Company discounts the spread between the future contractual interest payments and hypothetical future interest payments on mortgage debt and unsecured notes based on a current market rate. In determining the current market rate, the Company adds its estimation of a market spread to the quoted yields on federal government treasury securities with similar maturity dates to its debt. Because the Company's valuations of its financial instruments are based on these types of estimates, the actual fair value of its financial instruments may differ materially if the Company's estimates do not prove to be accurate. The following table presents the aggregate carrying value of the Company's indebtedness and the Company's corresponding estimate of fair value as of Decembernbsp;31, 2010 and 2009 (in thousands): /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p table border="0" cellspacing="0" cellpadding="0" width="100%" align="center" trtd width="56%" /td td valign="bottom" width="4%" /td td /td td /td td /td td valign="bottom" width="4%" /td td /td td /td td /td td valign="bottom" width="4%" /td td /td td /td td /td td valign="bottom" width="4%" /td td /td td /td td /td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="6" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bDecembernbsp;31, 2010/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="6" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bDecembernbsp;31, 2009/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bCarryingbr /Amount/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bEstimatedbr /Fair Value/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bCarryingbr /Amount/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bEstimatedbr /Fair Value/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Mortgage notes payable/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"3,047,586/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"3,121,193/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"2,643,301/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"2,615,099/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Unsecured senior notes/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"3,016,598/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"3,241,542/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"2,172,389/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"2,318,868/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Unsecured exchangeable senior notes/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,721,817/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"(1)nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,929,291/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,904,081/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"(1)nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"2,059,796/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Total/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"7,786,001/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"8,292,026/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"6,719,771/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"6,993,763/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td/tr/table p style="border-bottom: #000000 0.5pt solid; line-height: 8px; margin-top: 0px; width: 10%; margin-bottom: 2px;" /p table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="100%" trtd valign="top" width="4%" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"(1)/font/td td valign="top" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"Includes the net impact of ASC 470-20 (formerly known as FSP No. APB 14-1) totaling approximately $93.6 million and $140.4 million at Decembernbsp;31, 2010 and 2009, respectively (See Note 8). /font/td/tr/table /div

Derivative Instruments and Hedging Activities

div div class="MetaData" p style="margin-top: 0px; margin-bottom: 0px; margin-left: 2%;"font style="font-family: Times New Roman;" class="_mt" size="2"iDerivative Instruments and Hedging Activities /i/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"Derivative instruments and hedging activities require management to make judgments on the nature of its derivatives and their effectiveness as hedges. These judgments determine if the changes in fair value of the derivative instruments are reported in the consolidated statements of operations as a component of net income or as a component of comprehensive income and as a component of equity on the consolidated balance sheets. While management believes its judgments are reasonable, a change in a derivative's effectiveness as a hedge could materially affect expenses, net income and equity. The Company accounts for the effective portion of changes in the fair value of a derivative in other comprehensive income (loss) and subsequently reclassifies the effective portion to earnings over the term that the hedged transaction affects earnings. The Company accounts for the inef fective portion of changes in the fair value of a derivative directly in earnings. The Company recognized net derivative losses of approximately $font class="_mt"17.0/font million for the year ended Decembernbsp;31, 2008 within the caption Net Derivative Losses in the Consolidated Statements of Operations. /font/p/div /div

Income Taxes

div div class="MetaData" p style="margin-top: 0px; margin-bottom: 0px; margin-left: 2%;"font style="font-family: Times New Roman;" class="_mt" size="2"iIncome Taxes /i/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The Company has elected to be treated as a REIT under Sections 856 through 860 of the Internal Revenue Code of 1986, as amended (the "Code"), commencing with its taxable year ended Decembernbsp;31, 1997. As a result, the Company generally will not be subject to federal corporate income tax on its taxable income that is distributed to its stockholders. A REIT is subject to a number of organizational and operational requirements, including a requirement that it currently distribute at least font class="_mt"90/font% of its annual taxable income. The Company's policy is to distribute at least font class="_mt"100/font% of its taxable income. Accordingly, the only provision for federal income taxes in the accompanying consolidated financial statements relates to the Company's consolidated taxable REIT subsidiaries. The Company's taxable R EIT subsidiaries did not have significant tax provisions or deferred income tax items. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The Company owns a hotel property which is managed through a taxable REIT subsidiary. The hotel taxable REIT subsidiary, a wholly owned subsidiary of the Operating Partnership, is the lessee pursuant to the lease for the hotel property. As lessor, the Operating Partnership is entitled to a percentage of gross receipts from the hotel property. Marriott International, Inc. continues to manage the hotel property under the Marriott name and under terms of the existing management agreements. In connection with the restructuring, the revenue and expenses of the hotel property are being reflected in the Company's Consolidated Statements of Operations. The hotel taxable REIT subsidiary is subject to tax at the federal and state level and, accordingly, the Company has recorded a tax provision in the Company's Consolidated Statements of Operations for the years ended December p;nbsp;31, 2010, 2009 and 2008. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The net difference between the tax basis and the reported amounts of the Company's assets and liabilities is approximately $font class="_mt"1.2/font billion and $font class="_mt"1.4/font billion as of Decembernbsp;31, 2010 and 2009, respectively, which is primarily related to the difference in basis of contributed property and accrued rental income. /font/p p style="margin-top: 0px; margin-bottom: 0px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"Certain entities included in the Company's consolidated financial statements are subject to certain state and local taxes. These taxes are recorded as operating expenses in the accompanying consolidated financial statements. /font/p p style="margin-top: 12px; margin-bottom: 0px; font-size: 1px;"nbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The following reconciles GAAP net income attributable to Boston Properties, Inc. to taxable income: /fontfont class="_mt" size="1" /font/p table border="0" cellspacing="0" cellpadding="0" width="100%" align="center" trtd width="73%"nbsp;/td td valign="bottom" width="3%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td valign="bottom" width="3%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td valign="bottom" width="3%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="10" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bFor the year ended Decembernbsp;31,/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2010/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2009/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2008/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" colspan="10" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b(in thousands)/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Net income attributable to Boston Properties, Inc./font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"159,072/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"231,014/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"105,270/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Straight-line rent adjustments/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(75,943/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(38,287/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(20,432/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Book/Tax differences from depreciation and amortization/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"67,362/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"61,366/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"78,047/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Book/Tax differences on gains/losses from capital transactions/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(2,373/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(10,111/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(28,502/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Book/Tax differences from stock-based compensation/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(1,957/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"15,966/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(19,300/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Book/Tax differences on losses from early extinguishments of debt/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"6,448/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Impairment loss on investments in unconsolidated joint ventures/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"6,374/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"161,000/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Other book/tax differences, net/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"3,921/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"492/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"33,410/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom"nbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Taxable income/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"156,530/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"266,814/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"309,493/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom"nbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td/tr/table/div /div

Stock-based employee compensation plans

div div class="MetaData" p style="margin-top: 0px; margin-bottom: 0px; margin-left: 2%;"font style="font-family: Times New Roman;" class="_mt" size="2"iStock-based employee compensation plans /i/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"At Decembernbsp;31, 2010, the Company has a stock-based employee compensation plan. Effective Januarynbsp;1, 2005, the Company adopted early ASC 718 "Compensation ndash; Stock Compensation" ("ASC 718") (formerly SFAS No.nbsp;123 (revised) ("SFAS No.nbsp;123R"), "Share-Based Payment"), which revised the fair value based method of accounting for share-based payment liabilities, forfeitures and modifications of stock-based awards and clarified previous guidance in several areas, including measuring fair value, classifying an award as equity or as a liability and attributing compensation cost to reporting periods. /font/p/div /div

Use of Estimates in the Preparation of Financial Statements

div div class="MetaData" p style="margin-top: 0px; margin-bottom: 0px; margin-left: 2%;"font style="font-family: Times New Roman;" class="_mt" size="2"iUse of Estimates in the Preparation of Financial Statements /i/font/p p style="margin-top: 0px; margin-bottom: -6px;"font class="_mt" size="1" /fontnbsp;/p p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. These estimates include such items as depreciation and allowances for doubtful accounts. Actual results could differ from those estimates. /font/p/div /div

Summary of Significant Accounting Policies (Tables)	12 Months Ended
Summary of Significant Accounting Policies (Tables)	Dec. 31, 2010
Notes to Financial Statements
Tax Treatment of Common Dividends Per Share for Federal Tax Purposes	div div class="MetaData" table border="0" cellspacing="0" cellpadding="0" width="100%" align="center" trtd width="56%"nbsp;/td td valign="bottom" width="3%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td valign="bottom" width="3%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td valign="bottom" width="3%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td valign="bottom" width="3%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td valign="bottom" width="3%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td valign="bottom" width="3%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="22" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bFor the year ended Decembernbsp;31,/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="6" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2010/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="6" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2009/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="6" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2008/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bPernbsp;Share/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b%/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bPernbsp;Share/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b%/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bPernbsp;Share/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b%/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Ordinary income/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1.17/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"58.39/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"2.15/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"90.93/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"2.55/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"51.83/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Return of capital/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"0.83/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"41.61/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"0.21/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"9.07/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"2.37/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"48.17/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom"nbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Total/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"2.00/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"100.00/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"2.36/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"100.00/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"4.92/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"(1)nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"100.00/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom"nbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td/tr/table p style="border-bottom: #000000 0.5pt solid; line-height: 8px; margin-top: 0px; width: 10%; margin-bottom: 2px;" /p table style="border-collapse: collapse;" class="MetaData" border="0" cellspacing="0" cellpadding="0" width="100%" trtd valign="top" width="3%" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"(1)/font/td td class="MetaData" valign="top" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"Includes the special dividend of $font class="_mt"5.98/font per common share paid on Januarynbsp;30, 2008 of which approximately $font class="_mt"3.40/font per common share was allocable to 2007 and approximately $font class="_mt"2.58/font was allocable to 2008. /font/td/tr/table/div /div
Carrying Value of Indebtedness and Corresponding Estimate of Fair Value	div div class="MetaData" table border="0" cellspacing="0" cellpadding="0" width="100%" align="center" trtd width="56%"nbsp;/td td valign="bottom" width="4%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td valign="bottom" width="4%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td valign="bottom" width="4%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td valign="bottom" width="4%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="6" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bDecembernbsp;31, 2010/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="6" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bDecembernbsp;31, 2009/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bCarryingbr /Amount/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bEstimatedbr /Fair Value/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bCarryingbr /Amount/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bEstimatedbr /Fair Value/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Mortgage notes payable/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"3,047,586/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"3,121,193/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"2,643,301/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"2,615,099/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Unsecured senior notes/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"3,016,598/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"3,241,542/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"2,172,389/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"2,318,868/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Unsecured exchangeable senior notes/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,721,817/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"(1)nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,929,291/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,904,081/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"(1)nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"2,059,796/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom"nbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Total/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"7,786,001/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"8,292,026/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"6,719,771/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"6,993,763/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom"nbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td/tr/table p style="border-bottom: #000000 0.5pt solid; line-height: 8px; margin-top: 0px; width: 10%; margin-bottom: 2px;" /p table style="border-collapse: collapse;" class="MetaData" border="0" cellspacing="0" cellpadding="0" width="100%" trtd valign="top" width="4%" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"(1)/font/td td class="MetaData" valign="top" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"Includes the net impact of ASC 470-20 (formerly known as FSP No. APB 14-1) totaling approximately $font class="_mt"93.6/font million and $font class="_mt"140.4/font million at Decembernbsp;31, 2010 and 2009, respectively (See Note 8). /font/td/tr/table/div /div
GAAP Reconciliation of Net Income to Taxable Income	div table border="0" cellspacing="0" cellpadding="0" width="100%" align="center" trtd width="73%"nbsp;/td td valign="bottom" width="3%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td valign="bottom" width="3%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td valign="bottom" width="3%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="10" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bFor the year ended Decembernbsp;31,/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2010/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2009/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2008/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" colspan="10" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b(in thousands)/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Net income attributable to Boston Properties, Inc./font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"159,072/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"231,014/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"105,270/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Straight-line rent adjustments/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(75,943/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(38,287/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(20,432/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Book/Tax differences from depreciation and amortization/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"67,362/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"61,366/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"78,047/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Book/Tax differences on gains/losses from capital transactions/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(2,373/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(10,111/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(28,502/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Book/Tax differences from stock-based compensation/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(1,957/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"15,966/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(19,300/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Book/Tax differences on losses from early extinguishments of debt/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"6,448/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Impairment loss on investments in unconsolidated joint ventures/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"6,374/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"161,000/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Other book/tax differences, net/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"3,921/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"492/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"33,410/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom"nbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Taxable income/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"156,530/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"266,814/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"309,493/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom"nbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td/tr/table /div
Schedule Of Estimated Useful Lives	div table class="MetaData" border="0" cellspacing="0" cellpadding="0" width="90%" align="center" trtd width="53%"nbsp;/td td valign="bottom" width="4%"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Land improvements/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"font class="_mt"font style="font-family: Times New Roman;" class="_mt" size="2"25/font/fontnbsp;tonbsp;font class="_mt"40/font years/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Buildings and improvements/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"font class="_mt"font style="font-family: Times New Roman;" class="_mt" size="2"10/font/fontnbsp;tonbsp;font class="_mt"40/fontnbsp;years/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Tenant improvements/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td class="MetaData" valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"Shorternbsp;ofnbsp;usefulnbsp;lifenbsp;ornbsp;termsnbsp;ofnbsp;relatednbsp;lease/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Furniture, fixtures, and equipment/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"font class="_mt"font style="font-family: Times New Roman;" class="_mt" size="2"3 /font/fonttonbsp;font class="_mt"7/font years/font/td/tr/table /div

Real Estate (Tables)	12 Months Ended
Real Estate (Tables)	Dec. 31, 2010
Notes to Financial Statements
Schedule of Real Estate	div table border="0" cellspacing="0" cellpadding="0" width="100%" align="center" trtd width="75%" /td td valign="bottom" width="4%" /td td /td td /td td /td td valign="bottom" width="4%" /td td /td td /td td /td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2010/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2009/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Land/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"2,216,768/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,983,064/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Land held for future development/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"757,556/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"718,525/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Buildings and improvements/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"7,602,704/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"6,888,421/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Tenant improvements/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,090,462/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"922,224/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Furniture, fixtures and equipment/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"24,043/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"23,679/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Construction in progress/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,073,402/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"563,645/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Total/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"12,764,935/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"11,099,558/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Less: Accumulated depreciation/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(2,323,818/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(2,033,677/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" /td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"10,441,117/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"9,065,881/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td/tr/table /div
Estimated Annual Amortization of the Acquired Below Market Leases (Net of Acquired Above Market Leases) and The Acquired In-Place Lease Intangibles	div table border="0" cellspacing="0" cellpadding="0" width="80%" align="center" trtd width="55%" /td td valign="bottom" width="17%" /td td /td td /td td /td td valign="bottom" width="17%" /td td /td td /td td /td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" nowrap="nowrap" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bAcquirednbsp;In-Place/b/fontbr /font style="font-family: Times New Roman;" class="_mt" size="1"bLease Intangible/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bAcquirednbsp;Netnbsp;Below Marketnbsp;Leasenbsp;Intangible/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"2011/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"20,659/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(9,313/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"2012/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"19,305/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(9,389/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"2013/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"17,792/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(9,332/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"2014/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"15,890/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(9,171/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"2015/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"5,607/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(5,124/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr/table /div
Unaudited Pro Forma in Connection With Acquisition	div table border="0" cellspacing="0" cellpadding="0" width="100%" align="center" trtd width="78%" /td td valign="bottom" width="3%" /td td /td td /td td /td td valign="bottom" width="3%" /td td /td td /td td /td/tr trtd valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="1"bPro Forma/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="6" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bYear Ended Decembernbsp;31,/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr trtd valign="bottom" nowrap="nowrap" p style="border-bottom: #000000 1px solid; width: 125pt;"font style="font-family: Times New Roman;" class="_mt" size="1"b(in thousands, except per share data)/b/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2010/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2009/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Total revenue/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,657,995/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,625,309/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Income from continuing operations/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"169,404/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"243,412/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Net income attributable to Boston Properties, Inc./font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"143,202/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"214,282/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Basic earnings per share:/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Net income per share attributable to Boston Properties, Inc./font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1.03/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1.64/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Diluted earnings per share:/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Net income per share attributable to Boston Properties, Inc./font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1.02/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1.63/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr/table /div

Deferred Charges (Tables)	12 Months Ended
Deferred Charges (Tables)	Dec. 31, 2010
Notes to Financial Statements
Schedule of Deferred Charges	div table border="0" cellspacing="0" cellpadding="0" width="90%" align="center" trtd width="75%" /td td valign="bottom" width="6%" /td td /td td /td td /td td valign="bottom" width="5%" /td td /td td /td td /td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2010/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2009/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Leasing costs (and lease related intangibles)/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"558,620/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"399,302/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Financing costs/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"89,680/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"76,915/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" /td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"648,300/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"476,217/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Less: Accumulated amortization/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(212,281/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(181,822/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" /td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"436,019/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"294,395/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td/tr/table /div

Investments in Unconsolidated Joint Ventures (Tables)	12 Months Ended
Investments in Unconsolidated Joint Ventures (Tables)	Dec. 31, 2010
Notes to Financial Statements
Investments in Unconsolidated Joint Ventures	div div class="MetaData" table border="0" cellspacing="0" cellpadding="0" width="100%" align="center" trtd width="50%" /td td valign="bottom" width="1%" /td td width="38%" /td td valign="bottom" width="1%" /td td /td/tr trtd style="border-bottom: #000000 1px solid;" valign="bottom" nowrap="nowrap" align="center" p style="margin-top: 0px; margin-bottom: 1px;" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bEntity/b/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" align="center" p style="margin-top: 0px; margin-bottom: 1px;" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bProperties/b/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bNominalnbsp;%br /Ownership/b/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Square 407 Limited Partnership/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"Marketnbsp;Squarenbsp;North/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"font class="_mt"font style="font-family: Times New Roman;" class="_mt" size="2"50.0/font/font%/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"The Metropolitan Square Associates LLC/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"Metropolitan Square/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"font class="_mt"font style="font-family: Times New Roman;" class="_mt" size="2"51.0/font/font%/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"BP/CRF 901 New York Avenue LLC/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"901nbsp;Newnbsp;Yorknbsp;Avenue/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"font class="_mt"font style="font-family: Times New Roman;" class="_mt" size="2"25.0/font/font%(1)/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"WP Project Developer LLC/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"Wisconsin Place Land and Infrastructure/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"font class="_mt"font style="font-family: Times New Roman;" class="_mt" size="2"33.3/font/font%(2)/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"RBP Joint Venture/fontfont style="font-family: Times New Roman;" class="_mt" size="1"sup style="position: relative; bottom: 0.8ex; vertical-align: baseline;" /sup/fontfont style="font-family: Times New Roman;" class="_mt" size="2"LLC/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"Eighth Avenue and 46th/fontfont style="font-family: Times New Roman;" class="_mt" size="1"sup style="position: relative; bottom: 0.8ex; vertical-align: baseline;" /sup/fontfont style="font-family: Times New Roman;" class="_mt" size="2"Street/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"font class="_mt"font style="font-family: Times New Roman;" class="_mt" size="2"50.0/font/font%(3)/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Boston Properties Office Value-Added Fund, L.P./font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"300 Billericanbsp;Road and Mountain View Research and Technology Parks/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"font class="_mt"font style="font-family: Times New Roman;" class="_mt" size="2"36.9/font/font%(1)(4)/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Annapolis Junction NFM, LLC/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"Annapolis Junction/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"font class="_mt"font style="font-family: Times New Roman;" class="_mt" size="2"50.0/font/font%(5)/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"767 Venture, LLC/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"The General Motors Building/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"font class="_mt"font style="font-family: Times New Roman;" class="_mt" size="2"60.0/font/font%/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"2 GCT Venture LLC/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"Two Grand Central Tower/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"font class="_mt"font style="font-family: Times New Roman;" class="_mt" size="2"60.0/font/font%/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"540 Madison Venture LLC/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"540 Madison Avenue/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"font class="_mt"font style="font-family: Times New Roman;" class="_mt" size="2"60.0/font/font%/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"125 West 55/fontfont style="font-family: Times New Roman;" class="_mt" size="1"sup style="position: relative; bottom: 0.8ex; vertical-align: baseline;"th /sup/fontfont style="font-family: Times New Roman;" class="_mt" size="2"Street Venture LLC/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"125 West 55/fontfont style="font-family: Times New Roman;" class="_mt" size="1"sup style="position: relative; bottom: 0.8ex; vertical-align: baseline;"th /sup/fontfont style="font-family: Times New Roman;" class="_mt" size="2"Street/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"font class="_mt"font style="font-family: Times New Roman;" class="_mt" size="2"60.0/font/font%/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"500 North Capitol /fontfont style="font-family: Times New Roman;" class="_mt" size="1"sup style="position: relative; bottom: 0.8ex; vertical-align: baseline;" /sup/fontfont style="font-family: Times New Roman;" class="_mt" size="2"LLC/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"500 North Capitol Street, NW/fontfont style="font-family: Times New Roman;" class="_mt" size="1"sup style="position: relative; bottom: 0.8ex; vertical-align: baseline;" /sup/fontfont style="font-family: Times New Roman;" class="_mt" size="2" /font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"font class="_mt"font style="font-family: Times New Roman;" class="_mt" size="2"30.0/font/font%/font/td/tr/table p style="border-bottom: #000000 0.5pt solid; line-height: 8px; margin-top: 0px; width: 10%; margin-bottom: 2px;" /p table style="border-collapse: collapse;" class="MetaData" border="0" cellspacing="0" cellpadding="0" width="100%" trtd valign="top" width="4%" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"(1)/font/td td class="MetaData" valign="top" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"The Company's economic ownership can increase based on the achievement of certain return thresholds. /font/td/tr/table table style="border-collapse: collapse;" class="MetaData" border="0" cellspacing="0" cellpadding="0" width="100%" trtd valign="top" width="4%" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"(2)/font/td td class="MetaData" valign="top" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"The Company's wholly-owned entity that owns the office component of the project owns a font class="_mt"33.3/font% interest in the entity owning the land and infrastructure of the project. /font/td/tr/table table style="border-collapse: collapse;" class="MetaData" border="0" cellspacing="0" cellpadding="0" width="100%" trtd valign="top" width="4%" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"(3)/font/td td class="MetaData" valign="top" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"This property is not in operation and consists of assembled land. /font/td/tr/table table style="border-collapse: collapse;" class="MetaData" border="0" cellspacing="0" cellpadding="0" width="100%" trtd valign="top" width="4%" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"(4)/font/td td class="MetaData" valign="top" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"Represents the Company's effective ownership interest. The Company has a font class="_mt"25.0/font% interest in the 300 Billerica Road property and a font class="_mt"39.5/font% interest in the Mountain View Research and Technology Park properties. /font/td/tr/table table style="border-collapse: collapse;" class="MetaData" border="0" cellspacing="0" cellpadding="0" width="100%" trtd valign="top" width="4%" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"(5)/font/td td class="MetaData" valign="top" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"Two of the three Annapolis Junction land parcels are undeveloped land. /font/td/tr/table/div /div
Balance Sheets of the Unconsolidated Joint Ventures	div div class="MetaData" table border="0" cellspacing="0" cellpadding="0" width="100%" align="center" trtd width="78%" /td td valign="bottom" width="3%" /td td /td td /td td /td td valign="bottom" width="3%" /td td /td td /td td /td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="6" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bDecembernbsp;31,/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr trtd valign="bottom" nowrap="nowrap" p style="border-bottom: #000000 1px solid; width: 50pt;"font style="font-family: Times New Roman;" class="_mt" size="1"bBalance Sheets/b/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2010/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2009/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Real estate and development in process, net/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"5,028,851/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"5,149,868/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Other assets/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"749,308/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"760,001/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Total assets/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"5,778,159/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"5,909,869/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Mortgage and Notes payable/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"3,151,220/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"3,217,893/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Other liabilities/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"969,082/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,071,904/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Members'/Partners' equity/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,657,857/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,620,072/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Total liabilities and members'/partners' equity/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"5,778,159/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"5,909,869/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Company's share of equity/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"924,235/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"927,184/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Basis differential(1)/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(156,983/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(163,548/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Carrying value of the Company's investments in unconsolidated joint ventures/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"767,252/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"763,636/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td/tr/table p style="border-bottom: #000000 0.5pt solid; line-height: 8px; margin-top: 0px; width: 10%; margin-bottom: 2px;" /p table style="border-collapse: collapse;" class="MetaData" border="0" cellspacing="0" cellpadding="0" width="100%" trtd valign="top" width="4%" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"(1)/font/td td class="MetaData" valign="top" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"This amount represents the aggregate difference between the Company's historical cost basis and the basis reflected at the joint venture level, which is typically amortized over the life of the related assets and liabilities. Basis differentials occur from impairment of investments and upon the transfer of assets that were previously owned by the Company into a joint venture. In addition, certain acquisition, transaction and other costs may not be reflected in the net assets at the joint venture level. /font/td/tr/table/div /div
Schedule of Statements of Operations of the Unconsolidated Joint Ventures	div div class="MetaData" table border="0" cellspacing="0" cellpadding="0" width="100%" align="center" trtd /td td /td td /td td /td td /td td /td td /td td /td td /td td /td td /td td /td td /td/tr trtd valign="bottom" nowrap="nowrap" p style="border-bottom: #000000 1px solid; width: 86pt;"font style="font-family: Times New Roman;" class="_mt" size="1"bStatements of Operations/b/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="10" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bYear Ended Decembernbsp;31,/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2010/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2009/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2008/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" colspan="10" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b(in thousands)/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Total revenue(1)/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"607,915/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"595,533/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"363,168/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Expenses/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Operating/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"175,309/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"163,209/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"101,670/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Depreciation and amortization/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"215,533/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"232,047/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"144,712/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Total expenses/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"390,842/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"395,256/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"246,382/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd height="8" /td td height="8" colspan="4" /td td height="8" colspan="4" /td td height="8" colspan="4" /td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Operating income/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"217,073/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"200,277/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"116,786/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Other income (expense)/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Interest expense/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(235,723/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(232,978/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(139,154/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Gains (losses) from early extinguishments of debt/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"17,920/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(152/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Loss on guarantee obligation/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(3,800/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Impairment losses/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(24,568/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(40,570/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Net loss/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(4,530/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(57,269/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(63,090/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Company's share of net loss/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(5,691/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(22,197/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(30,910/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Impairment losses on investments/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(9,385/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(168,040/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Gain on sale of investment/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"572/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Basis differential/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"6,565/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"11,299/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Elimination of inter-entity interest on partner loan/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"35,328/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"32,341/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"16,932/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Income (loss) from unconsolidated joint ventures/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"36,774/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"12,058/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(182,018/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td/tr/table p style="border-bottom: #000000 0.5pt solid; line-height: 8px; margin-top: 0px; width: 10%; margin-bottom: 2px;" /p table style="border-collapse: collapse;" class="MetaData" border="0" cellspacing="0" cellpadding="0" width="100%" trtd valign="top" width="4%" align="left"font style="font-family: Times New Roman;" class="_mt" size="2"(1)/font/td td class="MetaData" valign="top" align="left" pfont style="font-family: Times New Roman;" class="_mt" size="2"Includes straight-line rent adjustments of $font class="_mt"24.5/font million, $font class="_mt"28.0/font million and $font class="_mt"14.9/font million for the years ended Decembernbsp;31, 2010, 2009 and 2008, respectively. Includes net "above" and "below" market rent adjustments of $font class="_mt"132.1/font million, $font class="_mt"157.5/font million and $font class="_mt"91.7/font million for the years ended Decembernbsp;31, 2010, 2009 and 2008, respectively. /font/p pnbsp;/p/td/tr/table/div /div

Mortgage Notes Payable (Tables)	12 Months Ended
Mortgage Notes Payable (Tables)	Dec. 31, 2010
Notes to Financial Statements
Schedule of Aggregate Principal Payments on Mortgage Notes	div table border="0" cellspacing="0" cellpadding="0" width="80%" align="center" trtd width="79%" /td td valign="bottom" width="11%" /td td /td td /td td /td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bPrincipalnbsp;Payments/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b(innbsp;thousands)/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"2011/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"471,818/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"2012/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"372,929/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"2013/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"101,289/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"2014/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"125,264/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"2015/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"14,312/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Thereafter/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,934,278/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Total aggregate principal payments/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"3,019,890/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Unamortized balance of historical fair value adjustments/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"27,696/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Total carrying value of mortgage notes payable/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"3,047,586/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td/tr/table /div

Unsecured Senior Notes (Tables)	12 Months Ended
Unsecured Senior Notes (Tables)	Dec. 31, 2010
Notes to Financial Statements
Schedule of Unsecured Senior Notes	div table border="0" cellspacing="0" cellpadding="0" width="100%" align="center" trtd width="53%" /td td valign="bottom" width="4%" /td td /td td /td td /td td valign="bottom" width="4%" /td td /td td /td td /td td valign="bottom" width="4%" /td td /td td /td td /td td valign="bottom" width="4%" /td td /td td /td td /td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bCoupon/br /Statednbsp;Rate/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bEffectivebr /Rate(1)/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bPrincipalbr /Amount/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bMaturity Date(2)/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"10 Year Unsecured Senior Notes/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"6.250/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"6.381/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"182,432/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"January 15,nbsp;2013/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"10 Year Unsecured Senior Notes/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"6.250/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"6.291/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"42,568/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"Januarynbsp;15,nbsp;2013/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"12 Year Unsecured Senior Notes/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"5.625/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"5.693/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"300,000/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"April 15, 2015/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"12 Year Unsecured Senior Notes/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"5.000/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"5.194/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"250,000/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"June 1, 2015/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"10 Year Unsecured Senior Notes/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"5.875/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"5.967/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"700,000/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"Octobernbsp;15,nbsp;2019/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"10 Year Unsecured Senior Notes/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"5.625/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"5.708/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"700,000/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"Novembernbsp;15,nbsp;2020/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"10 Year Unsecured Senior Notes/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"4.125/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"4.289/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"%nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"850,000/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"Maynbsp;15,nbsp;2021/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Total principal/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"3,025,000/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Net unamortized discount/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(8,402/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Total/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"3,016,598/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr/table /div

Noncontrolling Interests (Tables)	12 Months Ended
Noncontrolling Interests (Tables)	Dec. 31, 2010
Notes to Financial Statements
Noncontrolling Interests - Redeemable Preferred Units	div table border="0" cellspacing="0" cellpadding="0" width="90%" align="center" trtd width="89%" /td td valign="bottom" width="5%" /td td /td td /td td /td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Balance at Decembernbsp;31, 2007/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"55,652/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Net income/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"4,226/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Distributions/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(3,738/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Adjustments to reflect redeemable preferred units at redemption value/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(488/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Balance at Decembernbsp;31, 2008/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"55,652/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Net income/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"3,594/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Distributions/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(3,594/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Balance at Decembernbsp;31, 2009/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"55,652/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Net income/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"3,343/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Distributions/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(3,343/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Balance at Decembernbsp;31, 2010/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"55,652/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td/tr/table /div

Future Minimum Rents (Tables)	12 Months Ended
Future Minimum Rents (Tables)	Dec. 31, 2010
Notes to Financial Statements
Future Contractual Minimum Lease Payments Receivable	div table border="0" cellspacing="0" cellpadding="0" width="90%" align="center" trtd width="85%" /td td valign="bottom" width="6%" /td td /td td /td td /td/tr trtd valign="bottom" nowrap="nowrap" p style="margin-top: 0px; margin-bottom: 1px;"font style="font-family: Times New Roman;" class="_mt" size="1"bYears Ending Decembernbsp;31,/b/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b(innbsp;thousands)/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"2011/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,254,752/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"2012/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,228,751/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"2013/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,206,567/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"2014/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,160,446/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"2015/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,050,280/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Thereafter/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"5,242,678/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr/table /div

Earnings Per Share (Tables)	12 Months Ended
Earnings Per Share (Tables)	Dec. 31, 2010
Notes to Financial Statements
Computation of basic and diluted earnings per share	div div class="MetaData" p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font class="_mt" size="1" /font/p table border="0" cellspacing="0" cellpadding="0" width="100%" align="center" trtd /td td /td td /td td /td td /td td /td td /td td /td td /td td /td td /td td /td td /td/tr trtd valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="10" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bFor the year ended Decembernbsp;31, 2010/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bIncomebr /(Numerator)/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bSharesbr /(Denominator)/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bPerbr /Sharebr /Amount/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" colspan="10" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b(innbsp;thousands,nbsp;exceptnbsp;fornbsp;pernbsp;sharenbsp;amounts)/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Basic Earnings:/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Net income attributable to Boston Properties, Inc./font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"159,072/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"139,440/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1.14/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Effect of Dilutive Securities:/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Stock Based Compensation/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"617/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(0.00/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Diluted Earnings:/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Net income/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"159,072/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"140,057/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1.14/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td/tr/table div table border="0" cellspacing="0" cellpadding="0" width="100%" align="center" trtd width="68%"nbsp;/td td valign="bottom" width="5%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td valign="bottom" width="5%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td valign="bottom" width="5%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td/tr trtd valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="10" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bFor the year ended Decembernbsp;31, 2009/b/font/td td valign="bottom"nbsp;/td/tr trtd valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bIncomebr /(Numerator)/b/font/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bSharesbr /(Denominator)/b/font/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bPerbr /Sharebr /Amount/b/font/td td valign="bottom"nbsp;/td/tr trtd valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" colspan="10" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b(innbsp;thousands,nbsp;exceptnbsp;fornbsp;pernbsp;sharenbsp;amounts)/b/font/td td valign="bottom"nbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Basic Earnings:/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Net income attributable to Boston Properties, Inc./font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"231,014/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"131,050/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1.76/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Effect of Dilutive Securities:/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Stock Based Compensation/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"462/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(0.00/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Diluted Earnings:/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td/tr tr style="font-size: 1px;"td valign="bottom"nbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Net income/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"231,014/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"131,512/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1.76/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom"nbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td/tr/table p style="margin-top: 0px; margin-bottom: 0px;"nbsp;/p table border="0" cellspacing="0" cellpadding="0" width="100%" align="center" trtd width="68%"nbsp;/td td valign="bottom" width="5%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td valign="bottom" width="5%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td valign="bottom" width="5%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td/tr trtd valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="10" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bFor the year ended Decembernbsp;31, 2008/b/font/td td valign="bottom"nbsp;/td/tr trtd valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bIncomebr /(Numerator)/b/font/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bSharesbr /(Denominator)/b/font/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bPerbr /Sharebr /Amount/b/font/td td valign="bottom"nbsp;/td/tr trtd valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" colspan="10" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b(innbsp;thousands,nbsp;exceptnbsp;fornbsp;pernbsp;sharenbsp;amounts)/b/font/td td valign="bottom"nbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Basic Earnings:/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Net income attributable to Boston Properties, Inc./font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"105,270/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"119,980/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"0.88/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Effect of Dilutive Securities:/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Stock Based Compensation/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,319/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(0.01/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Diluted Earnings:/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td td valign="bottom"nbsp;/td/tr tr style="font-size: 1px;"td valign="bottom"nbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Net income/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"105,270/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"nbsp;/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"121,299/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"0.87/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr/table/div/div /div

Stock Option and Incentive Plan and Stock Purchase Plan (Tables)	12 Months Ended
	Dec. 31, 2010
Notes to Financial Statements
Schedule of Stock Options Status	div table border="0" cellspacing="0" cellpadding="0" width="90%" align="center" trtd width="76%" /td td valign="bottom" width="5%" /td td /td td /td td /td td valign="bottom" width="4%" /td td /td td /td td /td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bShares/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bWeightedbr /Averagebr /Exercisebr /Price/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Outstanding at Decembernbsp;31, 2007/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"2,264,535/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"35.22/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Granted/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Exercised/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(1,058,133/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"36.36/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Canceled/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Outstanding at Decembernbsp;31, 2008/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,206,402/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"34.23/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Granted/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Exercised/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(242,507/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"33.41/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Canceled/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Outstanding at Decembernbsp;31, 2009/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"963,895/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"34.44/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Granted/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Exercised/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(638,957/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"35.35/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Canceled/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"#8212;nbsp;nbsp;/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Outstanding at Decembernbsp;31, 2010/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"324,938/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"32.65/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td/tr/table /div
Schedule of Stock Options Outstanding	div table border="0" cellspacing="0" cellpadding="0" width="100%" align="center" trtd width="25%" /td td valign="bottom" width="9%" /td td /td td /td td /td td valign="bottom" width="9%" /td td /td td /td td /td td valign="bottom" width="9%" /td td /td td /td td /td td valign="bottom" width="9%" /td td /td td /td td /td td valign="bottom" width="9%" /td td /td td /td td /td/tr trtd style="border-bottom: #000000 1px solid;" valign="bottom" colspan="12" nowrap="nowrap" align="center" p style="margin-top: 0px; margin-bottom: 1px;" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bOptions Outstanding/b/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="6" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bOptions Exercisable/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr trtd valign="bottom" nowrap="nowrap" align="center" p style="margin-top: 0px; margin-bottom: 0px;" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bRangenbsp;ofnbsp;Exercise/b/font/p p style="border-bottom: #000000 1px solid; margin-top: 0px; width: 61pt; margin-bottom: 1px;" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bPrices/b/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" nowrap="nowrap" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bNumberbr /Outstandingnbsp;atbr /12/31/10/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" nowrap="nowrap" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bWeighted-Averagebr /Remainingbr /Contractual Life/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" nowrap="nowrap" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bWeighted-Averagebr /Exercise Price/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" nowrap="nowrap" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bNumbernbsp;Exercisablebr /at 12/31/10/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" nowrap="nowrap" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bWeighted-Averagebr /Exercise Price/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="bottom" align="center"font style="font-family: Times New Roman;" class="_mt" size="2"$font class="_mt"32.62/font-$font class="_mt"34.14/font/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"324,938/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1.1nbsp;Years/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"32.65/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"324,938/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"32.65/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr/table /div

Selected Interim Financial Information (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009
Notes to Financial Statements
Selected Quarterly Information	div table border="0" cellspacing="0" cellpadding="0" width="100%" align="center" trtd width="57%"nbsp;/td td valign="bottom" width="4%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td valign="bottom" width="4%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td valign="bottom" width="4%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td valign="bottom" width="4%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="14" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2010 Quarter Ended/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bMarchnbsp;31,/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bJunenbsp;30,/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bSeptembernbsp;30,/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bDecembernbsp;31,/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" colspan="14" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b(in thousands, except for per share amounts)/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Total revenue/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"378,071/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"393,841/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"386,410/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"392,482/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Income (loss) from continuing operations/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"60,742/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"71,518/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"68,089/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(12,756/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Net income (loss) attributable to Boston Properties, Inc./font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"52,714/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"61,412/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"57,668/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(12,903/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Income (loss) attributable to Boston Properties, Inc. per share#8212;basic/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"0.38/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"0.44/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"0.41/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(0.09/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Income (loss) attributable to Boston Properties, Inc. per share#8212;diluted/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"0.38/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"0.44/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"0.41/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(0.09/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr/table /div	div table border="0" cellspacing="0" cellpadding="0" width="100%" align="center" trtd width="60%"nbsp;/td td valign="bottom" width="3%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td valign="bottom" width="3%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td valign="bottom" width="3%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td valign="bottom" width="3%"nbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="14" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2009 Quarter Ended/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bMarchnbsp;31,/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bJunenbsp;30,/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bSeptembernbsp;30,/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"bDecembernbsp;31,/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" colspan="14" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b(in thousands, except for per share amounts)/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Total revenue/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"377,224/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"389,048/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"375,790/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"376,128/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Income from continuing operations/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"51,235/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"75,580/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"75,256/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"60,668/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Net income attributable to Boston Properties, Inc./font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"44,598/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"67,152/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"65,795/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"53,317/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Income attributable to Boston Properties, Inc. per share#8212;basic/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"0.37/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"0.54/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"0.47/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"0.38/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Income attributable to Boston Properties, Inc. per share#8212;diluted/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"0.37/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"0.53/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"0.47/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"0.38/font/td td valign="bottom" nowrap="nowrap"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr/table /div

Real Estate and Accumulated Depreciation (Tables)	12 Months Ended
Real Estate and Accumulated Depreciation (Tables)	Dec. 31, 2010
Notes to Financial Statements
Activity for Real Estate and Accumulated Depreciation	div table border="0" cellspacing="0" cellpadding="0" width="100%" align="center" trtd width="64%" /td td valign="bottom" width="3%" /td td /td td /td td /td td valign="bottom" width="3%" /td td /td td /td td /td td valign="bottom" width="3%" /td td /td td /td td /td/tr trtd valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2010/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2009/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"font style="font-family: Times New Roman;" class="_mt" size="1"b2008/b/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Real Estate:/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Balance at the beginning of the year/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"11,075,879/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"10,602,278/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"10,231,881/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 5em;"font style="font-family: Times New Roman;" class="_mt" size="2"Additions to/improvements of real estate/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,669,926/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"481,237/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"620,633/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 5em;"font style="font-family: Times New Roman;" class="_mt" size="2"Assets sold/written-off/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(4,913/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(7,636/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(250,236/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Balance at the end of the year/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"12,740,892/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"11,075,879/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"10,602,278/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 1em;"font style="font-family: Times New Roman;" class="_mt" size="2"Accumulated Depreciation:/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom" /td td valign="bottom" /td td valign="bottom" /td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Balance at the beginning of the year/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"2,020,056/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,755,600/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,519,795/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 5em;"font style="font-family: Times New Roman;" class="_mt" size="2"Depreciation expense/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"292,561/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"269,394/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"258,789/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr bgcolor="#cceeff"td valign="top" p style="text-indent: -1em; margin-left: 5em;"font style="font-family: Times New Roman;" class="_mt" size="2"Assets sold/written-off/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(3,952/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(4,938/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"(22,984/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2")nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td td style="border-top: #000000 1px solid;" valign="bottom"nbsp;/td tdnbsp;/td/tr trtd valign="top" p style="text-indent: -1em; margin-left: 3em;"font style="font-family: Times New Roman;" class="_mt" size="2"Balance at the end of the year/font/p/td td valign="bottom"font class="_mt" size="1"nbsp;nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"2,308,665/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"2,020,056/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td td valign="bottom"font class="_mt" size="1"nbsp;/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"$/font/td td valign="bottom" align="right"font style="font-family: Times New Roman;" class="_mt" size="2"1,755,600/font/td td valign="bottom"font style="font-family: Times New Roman;" class="_mt" size="2"nbsp;nbsp;/font/td/tr tr style="font-size: 1px;"td valign="bottom" /td td valign="bottom"nbsp;nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td td valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td td style="border-top: #000000 3px double;" valign="bottom"nbsp;/td tdnbsp;/td/tr/table /div

Organization and Basis of Presentation (Narrative) (Details) sqft in Millions	12 Months Ended
	Dec. 31, 2010 sqft years shares	Dec. 31, 2009
Notes to Financial Statements
General and limited partnership interest in the Operating Partnership	86.20%	86.00%
Restriction on redemption of OP units from date of issuance (years) \| years	1
One OP unit is equivalent to one share of Common Stock \| shares	1
Number of series of preferred units outstanding	1
OP unit conversion rate	1
Number of commercial real estate properties owned or had an interest in	146
Net rentable square feet of 146 real estate properties	39.9
Properties under construction	5
Net rentable square feet of properties under construction	2.0
Number of vehicles in structured parking	40,664
Area of parking in square feet	13.7
Total office properties owned or had an interest in	140
Class A office properties	121
Office properties under construction owned	3
Office/Technical properties	19
Hotels owned	1
Retail properties owned	3
Residential properties under construction owned	2
Area of undeveloped land parcels owned in acres	513.3
Value-added fund institutional investors	2
Value-Added Fund investments in 24 buildings	24

Summary of Significant Accounting Policies (Narrative) (Details)	12 Months Ended
	Dec. 31, 2010 USD ($) years	Dec. 31, 2009 USD ($)	Dec. 31, 2008 USD ($)	Dec. 31, 2007 USD ($)
Statement [Line Items]
Probable sale term of property after classified as held for sale in years	1
Maximum period after construction the Company considers a construction project as substantially completed (years) \| years	1
Interest costs capitalized	$ 40,981,000	$ 48,816,000	$ 46,286,000
Salaries and related costs capitalized	$ 6,200,000	7,900,000	7,800,000
Tenant improvements, estimated useful life	Shorter of useful life or terms of related lease
FDIC insurance limit	$ 250,000
Unregistered money market fund, par value				$ 1.00
Gains (losses) from investments in securities	$ 935,000	2,434,000	(4,604,000)
Tenant and other accounts receivable, expected collection period (years) \| years	1
Separate unrestricted cash for deferred compensation plan	$ 8,700,000	9,900,000
Internal leasing salaries and related costs capitalized	$ 5,400,000	3,300,000	4,400,000
Reserve for straight line rent balance associated with two leases in New York City			21,000,000
Number of leases in New York City \| years	2
Net derivative losses			(17,021,000)
REIT annual taxable income distribution requirement percentage	90.00%
Company annual taxable income distribution	100.00%
Net difference between tax basis and Company's assets and liabilities	$ 1,200,000,000	1,400,000,000
Investment In Unregistered Money Market Fund [Member]
Statement [Line Items]
Gains (losses) from investments in securities		200,000	(1,400,000)
Investment In Deferred Compensation Plan [Member]
Statement [Line Items]
Gains (losses) from investments in securities	900,000	2,200,000	(3,200,000)
Company Amount [Member]
Statement [Line Items]
Straight-line rent adjustments	85,100,000	42,200,000	24,500,000
Above And Below Market Rent Adjustments	$ 2,400,000	$ 4,200,000	$ 5,400,000

Summary of Significant Accounting Policies (Tax Treatment of Common Dividends Per Share for Federal Tax Purposes) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Jan. 30, 2008	Dec. 31, 2007
Statement [Line Items]
Dividends, treatment for federal tax purposes	$ 2.00	$ 2.36	$ 4.92
Dividends, treatment for federal tax purposes (percent)	100.00%	100.00%	100.00%
Special dividends common stock per share			$ 2.58	$ 5.98	$ 3.40
Ordinary Income [Member]
Statement [Line Items]
Dividends, treatment for federal tax purposes	$ 1.17	$ 2.15	$ 2.55
Dividends, treatment for federal tax purposes (percent)	58.39%	90.93%	51.83%
Return of Capital [Member]
Statement [Line Items]
Dividends, treatment for federal tax purposes	$ 0.83	$ 0.21	$ 2.37
Dividends, treatment for federal tax purposes (percent)	41.61%	9.07%	48.17%

Summary of Significant Accounting Policies (Carrying Value of Indebtedness and Corresponding Estimate of Fair Value) (Details) - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 31, 2009
Statement [Line Items]
Net of the adjustment for the equity component allocation	$ 93,628
Unsecured exchangeable senior notes	1,721,817	$ 1,904,081
ASC 470-20 Adjustment [Member]
Statement [Line Items]
Net of the adjustment for the equity component allocation	93,600	140,400
Carrying Amount [Member]
Statement [Line Items]
Unsecured exchangeable senior notes	1,721,817	1,904,081
Total	7,786,001	6,719,771
Estimated Fair Value [Member]
Statement [Line Items]
Unsecured exchangeable senior notes	1,929,291	2,059,796
Total	$ 8,292,026	$ 6,993,763

Summary of Significant Accounting Policies (GAAP Reconciliation of Net Income to Taxable Income) (Details) - GAAP Reconciliation of Net Income to Taxable Income [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Statement [Line Items]
Straight line rent adjustments	$ (75,943)	$ (38,287)	$ (20,432)
Book/Tax differences from depreciation and amortization	67,362	61,366	78,047
Book/Tax differences on gains/losses from capital transactions	(2,373)	(10,111)	(28,502)
Book/Tax differences from stock-based compensation	(1,957)	15,966	(19,300)
Book/Tax differences on losses from early extinguishments of debt	6,448
Impairment loss on investments in unconsolidated joint ventures		6,374	161,000
Other book/tax differences, net	3,921	492	33,410
Taxable income	$ 156,530	$ 266,814	$ 309,493

Real Estate (Schedule of Real Estate) (Details) - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 31, 2009
Notes to Financial Statements
Land	$ 2,216,768	$ 1,983,064
Land held for future development	757,556	718,525
Buildings and improvements	7,602,704	6,888,421
Tenant improvements	1,090,462	922,224
Furniture, fixtures and equipment	24,043	23,679
Construction in progress	$ 1,073,402	$ 563,645

Real Estate (Narrative) (Details) $ in Thousands	9 Months Ended	12 Months Ended
Real Estate (Narrative) (Details) $ in Thousands	Sep. 30, 2009 USD ($)	Dec. 31, 2011	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2008 USD ($)	Dec. 29, 2010 USD ($)
Statement [Line Items]
Mortgage note payable assumed in connection with the acquisition of real estate			$ 843,104
Acquisition costs expensed			2,614
Gain on sale recognized			2,734	$ 11,760	$ 33,340
Reston Virginia [Member]
Statement [Line Items]
Acquisition aggregate purchase price			20,300
Five One Zero Madison Avenue [Member]
Statement [Line Items]
Acquisition aggregate purchase price			287,000
Acquisition closing costs			1,500
Junior mezzanine loan interest acquisition costs			$ 22,500
Net rentable square feet of acquisition			347,000
Mortgage note payable assumed in connection with the acquisition of real estate			$ 202,600
Variable interest spread over LIBOR			0.30%
Maturity date			Feb. 24, 2012
John Hancock Tower and Garage in Boston [Member]
Statement [Line Items]
Acquisition aggregate purchase price			$ 930,000			$ 930,000
Acquisition closing costs			$ 289,500
Net rentable square feet of acquisition			1,700,000
Maturity date			Jan. 06, 2017
Interest at a fixed rate			5.68%
Acquisition costs expensed			$ 900
Estimated cost of projects and improvements, aggregate cost to complete			35,300
Estimated cost of projects and improvements			$ 46,000
Number of stories in building			62
Number of levels in parking facility			8
Number of spaces in parking facility			2,013
Two Five Zero West Fifty-Fifth Street [Member]
Statement [Line Items]
Office building, construction suspended, square feet			1,000,000
Costs accrued related to suspension of development	$ 27,800
Settlement of termination of the lease agreement			$ 12,800
Amount recognized due to termination of the lease agreement			$ 7,200
Weston Corporate Center in Weston Massachusetts [Member]
Statement [Line Items]
Net rentable area (square feet)			356,000
Office property percentage leased			100.00%
Atlantic Wharf Development in Boston [Member]
Statement [Line Items]
Office property percentage leased		79.00%
Residential rental apartments, units			86
Wharf project retail space, square feet			10,000
Partners contribution to the project			$ 14,000
Number of installments			3
Installment years		2011	2010
Greater Washington, DC [Member]
Statement [Line Items]
Net rentable square feet of development			165,000
Gain on sale recognized			$ 1,800
Two Eight Zero Park Avenue [Member]
Statement [Line Items]
Gain on sale recognized			1,000
Management fees revenue			12,200
Contractual Amount Due Pursuant To Lease Agreement [Member] \| Two Five Zero West Fifty-Fifth Street [Member]
Statement [Line Items]
Costs accrued related to suspension of development	$ 20,000
Cumulative Gain [Member] \| Greater Washington, DC [Member]
Statement [Line Items]
Gain on sale recognized			$ 23,400

Real Estate (Schedule of Allocation of the Aggregate Purchase Price of Acquisition) (Details) - John Hancock Tower and Garage in Boston [Member] - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 29, 2010
Statement [Line Items]
Land		$ 219,543
Buildings and improvements		627,074
Tenant improvements		40,810
Tenant leasing costs		114,494
Other assets/liabilities, net		33,045
Above market rents		15,368
Below market rents		97,481
Above market assumed debt adjustment		(22,853)
Aggregate purchase price	$ 930,000	930,000
Net assets acquired		$ 289,500

Real Estate (Estimated Annual Amortization of the Acquired Below Market Leases (Net of Acquired Above Market Leases) and the Acquired In-Place Lease Intangibles) (Details) - John Hancock Tower and Garage in Boston [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2010 USD ($)
Acquired In-Place Lease Intangible [Member]
Statement [Line Items]
2011	$ 20,659
2012	19,305
2013	17,792
2014	15,890
2015	5,607
Acquired Net Below Market Lease Intangible [Member]
Statement [Line Items]
2011	(9,313)
2012	(9,389)
2013	(9,332)
2014	(9,171)
2015	$ (5,124)

Real Estate (Unaudited Pro Forma In Connection With Acquisition) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009
Statement [Line Items]
Total revenue	$ 1,657,995	$ 1,625,309
Income from continuing operations	169,404	243,412
Net income attributable to Boston Properties, Inc.	$ 143,202	$ 214,282
Net income per share attributable to Boston Properties, Inc.	$ 1.03	$ 1.64
Net income per share attributable to Boston Properties, Inc.	$ 1.02	$ 1.63

Deferred Charges (Details) - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 31, 2009
Notes to Financial Statements
Leasing costs (and lease related intangibles)	$ 558,620	$ 399,302
Financing costs	89,680	76,915
Deferred costs, gross	648,300	476,217
Less: Accumulated amortization	(212,281)	(181,822)
Deferred charges, total	$ 436,019	$ 294,395

Investments in Unconsolidated Joint Ventures (Investments in Unconsolidated Joint Ventures Table) (Details)	12 Months Ended
	Dec. 31, 2010
Three Zero Zero Billerica Road [Member]
Statement [Line Items]
Ownership percentage	25.00%
Mountain View Research And Technology Parks [Member]
Statement [Line Items]
Ownership percentage	39.50%
Entity Owning Land And Infrastructure Of Project [Member]
Statement [Line Items]
Ownership percentage	33.30%
Square Four Zero Seven Limited Partnership [Member]
Statement [Line Items]
Ownership percentage	50.00%
Properties	Market Square North
The Metropolitan Square Associates LLC [Member]
Statement [Line Items]
Ownership percentage	51.00%
Properties	Metropolitan Square
BP/CRF Nine Zero One New York Avenue LLC [Member]
Statement [Line Items]
Ownership percentage	25.00%
Properties	901 New York Avenue
WP Project Developer LLC [Member]
Statement [Line Items]
Ownership percentage	33.30%
Properties	Wisconsin Place Land and Infrastructure
RBP Joint Venture LLC [Member]
Statement [Line Items]
Ownership percentage	50.00%
Properties	Eighth Avenue and 46th Street
Boston Properties Office Value-Added Fund, L.P. [Member]
Statement [Line Items]
Ownership percentage	36.90%
Properties	300 Billerica Road and Mountain View Research and Technology Parks
Annapolis Junction NFM, LLC [Member]
Statement [Line Items]
Ownership percentage	50.00%
Properties	Annapolis Junction
Parcels of undeveloped land	0.67
Seven Six Seven Venture, LLC [Member]
Statement [Line Items]
Ownership percentage	60.00%
Properties	The General Motors Building
Two GCT Venture LLC [Member]
Statement [Line Items]
Ownership percentage	60.00%
Properties	Two Grand Central Tower
Five Four Zero Madison Venture LLC [Member]
Statement [Line Items]
Ownership percentage	60.00%
Properties	540 Madison Avenue
One Two Five West Fifty-Fifth Street Venture LLC [Member]
Statement [Line Items]
Ownership percentage	60.00%
Properties	125 West 55th Street
Five Zero Zero North Capitol LLC [Member]
Statement [Line Items]
Ownership percentage	30.00%
Properties	500 North Capitol Street, NW

Investments in Unconsolidated Joint Ventures (Balance Sheet of the Unconsolidated Joint Ventures Table) (Details) - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 31, 2009
Statement [Line Items]
Carrying value of the Company's investments in unconsolidated joint ventures	$ 767,252	$ 763,636
Unconsolidated Joint Ventures [Member]
Statement [Line Items]
Total assets	5,778,159	5,909,869
Members'/Partners' equity	1,657,857	1,620,072
Total liabilities and members'/partners' equity	5,778,159	5,909,869
Company's share of equity	924,235	927,184
Basis differential	(156,983)	(163,548)
Carrying value of the Company's investments in unconsolidated joint ventures	$ 767,252	$ 763,636

Investments in Unconsolidated Joint Ventures (Statements of Operations of the Joint Ventures Table) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Statement [Line Items]
Depreciation and amortization	$ 338,371	$ 321,681	$ 304,147
Total expenses	940,290	950,659	892,052
Interest expense	(378,079)	(322,833)	(295,322)
Gains (losses) from early extinguishments of debt	(89,883)	(510)
Income (loss) from unconsolidated joint ventures	36,774	12,058	(182,018)
Unconsolidated Joint Ventures [Member]
Statement [Line Items]
Depreciation and amortization	215,533	232,047	144,712
Total expenses	390,842	395,256	246,382
Interest expense	(235,723)	(232,978)	(139,154)
Gains (losses) from early extinguishments of debt	17,920		(152)
Loss on guarantee obligation	(3,800)
Impairment losses		(24,568)	(40,570)
Company's share of net loss	(5,691)	(22,197)	(30,910)
Impairment loss on investments		(9,385)	(168,040)
Gain on sale of investment	572
Basis differential	6,565	11,299
Elimination of inter-entity interest on partner loan	35,328	32,341	16,932
Income (loss) from unconsolidated joint ventures	$ 36,774	$ 12,058	$ (182,018)

Investments in Unconsolidated Joint Ventures (Statements of Operations of the Joint Ventures) (Parenthetical) (Details) - Unconsolidated Joint Ventures [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Statement [Line Items]
Straight-line rent adjustments	$ 24.5	$ 28.0	$ 14.9
Above and below market rent adjustments, net	$ 132.1	$ 157.5	$ 91.7

Investments in Unconsolidated Joint Ventures (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2010 USD ($) shares	Dec. 31, 2009 USD ($)
Statement [Line Items]
Gains (losses) from early extinguishments of debt	$ (89,883)	$ (510)
One Two Five West Fifty-Fifth Street Venture LLC [Member]
Statement [Line Items]
Ownership percentage	60.00%
Guarantee maximum funding obligation, 125 West 55th Street	$ 21,300
Cash deposit into the escrow account	10,000
Escrow account remaining funding obligation	11,300
Maximum funding obligation	$ 7,200
One Two Five West Fifty-Fifth Street Venture LLC [Member] \| Mezzanine Loans [Member]
Statement [Line Items]
Interest at a fixed rate	7.81%
Maturity date	Mar. 01, 2010
Five Zero Zero North Capitol LLC [Member]
Statement [Line Items]
Ownership percentage	30.00%
North Capital Street net rentable square feet	176,000
Investment in joint venture, total cost	$ 1,900
Investment in joint venture, common units issued \| shares	5,906
Five Zero Zero North Capitol LLC [Member] \| New Mortgage Loan [Member]
Statement [Line Items]
Variable interest rate at period end	5.75%
Debt instrument interest rate, minimum	5.75%
Maturity date	Mar. 31, 2013
Two GCT Venture LLC [Member]
Statement [Line Items]
Ownership percentage	60.00%
Two GCT Venture LLC [Member] \| Previous Mortgage Loan [Member]
Statement [Line Items]
Interest at a fixed rate	5.10%
Repayment of previous mortgage by investor	$ 10,000
Maturity date	Jul. 11, 2010
Two GCT Venture LLC [Member] \| New Mortgage Loan [Member]
Statement [Line Items]
Interest at a fixed rate	6.00%
Maturity date	Apr. 10, 2015
The Metropolitan Square Associates LLC [Member]
Statement [Line Items]
Ownership percentage	51.00%
Distribution of excess loan proceeds to partners	$ 49,000
Distribution of excess loan proceeds, company share	$ 25,000
The Metropolitan Square Associates LLC [Member] \| Previous Mortgage Loan [Member]
Statement [Line Items]
Interest at a fixed rate	8.23%
Maturity date	May 01, 2010
The Metropolitan Square Associates LLC [Member] \| New Mortgage Loan [Member]
Statement [Line Items]
Interest at a fixed rate	5.75%
Maturity date	May 05, 2020
Eighth Avenue and Forty-Sixth Street New York [Member]
Statement [Line Items]
Ownership percentage	50.00%
Land parcels and development rights received in exchange	$ 6,400
Land parcels and development rights relinquished in exchange	5,400
Payment from land parcels and development rights	$ 1,000
Mortgage Repayment Date	Jun. 15, 2010
Annapolis Junction NFM, LLC [Member]
Statement [Line Items]
Ownership percentage	50.00%
Variable interest spread over LIBOR	1.00%
Mortgage loan extension option, years	1
Maturity date	Sep. 12, 2011
Market Square North [Member]
Statement [Line Items]
Ownership percentage	50.00%
Distribution of excess loan proceeds to partners	$ 40,800
Distribution of excess loan proceeds, company share	$ 20,400
Market Square North [Member] \| Previous Mortgage Loan [Member]
Statement [Line Items]
Interest at a fixed rate	7.70%
Maturity date	Dec. 19, 2010
Market Square North [Member] \| New Mortgage Loan [Member]
Statement [Line Items]
Interest at a fixed rate	4.85%
Maturity date	Oct. 01, 2020
One and Two Circle Star Way [Member]
Statement [Line Items]
Interest at a fixed rate	6.57%
Payment amount for guaruntee obligation	$ 3,800
Gains (losses) from early extinguishments of debt	$ 17,900
Maturity date	Sep. 01, 2013
Wisconsin Place Retail [Member]
Statement [Line Items]
Ownership percentage	5.00%
Equity method investment, net sales proceeds	$ 1,400
Gain on sale of investment	$ 600
Joint Venture Which Refinanced Mortgage [Member] \| One Two Five West Fifty-Fifth Street Venture LLC [Member] \| Previous Mortgage Loan [Member]
Statement [Line Items]
Interest at a fixed rate	5.75%
Maturity date	Mar. 01, 2010
Joint Venture Which Refinanced Mortgage [Member] \| One Two Five West Fifty-Fifth Street Venture LLC [Member] \| New Mortgage Loan [Member]
Statement [Line Items]
Interest at a fixed rate	6.09%
Guarantee maximum funding obligation, 125 West 55th Street	$ 21,300
Cash deposit into the escrow account	10,000
Escrow account remaining funding obligation	$ 11,300
Maturity date	Mar. 10, 2015
Joint Venture Which Modified Mortgage [Member] \| One Two Five West Fifty-Fifth Street Venture LLC [Member] \| New Mortgage Loan [Member]
Statement [Line Items]
Maturity date	Mar. 10, 2020

Mortgage Notes Payable (Narratives) (Details) - USD ($)	12 Months Ended
Mortgage Notes Payable (Narratives) (Details) - USD ($)	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Statement [Line Items]
Minimum number of buildings used as collateral for mortgage	1
Mortgage note payable assumed in connection with the acquisition of real estate	$ 843,104,000
Construction loan facility amount outstanding	The Company has not drawn any amounts under the facility.
Number of mortgage loans accounted for at fair value	6	6
Outstanding balance of mortgage loans accounted for at fair value	$ 883,400,000	$ 295,000,000
Interest expense decrease due to recording mortgage loans at fair value	3,800,000	4,100,000	$ 4,300,000
Cumulative liability related to fair value adjustments included in mortgage notes payable	$ 27,700,000	$ 9,100,000
Eight Cambridge Center [Member]
Statement [Line Items]
Interest at a fixed rate	7.73%
Maturity date	Jul. 15, 2010
Pre-payment penalty	$ 0
Two Zero Two, Two Zero Six, And Two One Four Carnegie Center [Member]
Statement [Line Items]
Interest at a fixed rate	8.13%
Maturity date	Oct. 01, 2010
Pre-payment penalty	$ 0
Reservoir Place [Member]
Statement [Line Items]
Variable interest spread over LIBOR	3.85%
Variable interest spread over Eurodollar	2.20%
Maturity date	Jul. 30, 2014
Five One Zero Madison Avenue [Member]
Statement [Line Items]
Variable interest spread over LIBOR	0.30%
Maturity date	Feb. 24, 2012
Mortgage note payable assumed in connection with the acquisition of real estate	$ 202,600,000
Atlantic Wharf Development [Member]
Statement [Line Items]
Variable interest spread over LIBOR	3.00%
Maturity date	Apr. 21, 2012
Construction loan facility borrowing capacity	$ 215,000,000
Number of extensions	2
Length of extensions, years	1
Reduced construction loan facility borrowing capacity	$ 192,500,000
South Of Market [Member]
Statement [Line Items]
Variable interest spread over LIBOR	1.00%
Maturity date	Nov. 21, 2010
Pre-payment penalty	$ 0
Democracy Tower [Member]
Statement [Line Items]
Variable interest spread over LIBOR	1.75%
Maturity date	Dec. 19, 2010
Pre-payment penalty	$ 0
Ten And Twenty Burlington Mall Road And Nine One Hartwell Avenue [Member]
Statement [Line Items]
Interest at a fixed rate	7.25%
Maturity date	Oct. 01, 2011
Pre-payment penalty	$ 300,000
One Three Three Zero Connecticut Avenue [Member]
Statement [Line Items]
Interest at a fixed rate	7.58%
Maturity date	Feb. 26, 2011
Pre-payment penalty	$ 0
Wisconsin Place Office [Member]
Statement [Line Items]
Variable interest spread over LIBOR	1.10%
Maturity date	Jan. 29, 2011
Pre-payment penalty	$ 0
John Hancock Tower and Garage in Boston [Member]
Statement [Line Items]
Interest at a fixed rate	5.68%
Maturity date	Jan. 06, 2017
Outstanding balance of mortgage loans accounted for at fair value	$ 663,400,000
Interest rate used to account for mortgage loan at fair value upon assumption	5.00%
Mortgages [Member]
Statement [Line Items]
Final maturity date of mortgage notes	August 1, 2021
Fixed Rate Mortgages [Member]
Statement [Line Items]
Contractual interest rate, range minimum	5.55	5.55
Contractual interest rate, range maximum	7.75	8.13
Contractual interest rate, weighted average	6.18%	6.45%
Variable Rate Mortgages [Member]
Statement [Line Items]
Spread Over LIBOR Range Minimum	0.30%	1.00%
Spread Over LIBOR Range Maximum	2.20%	3.85%
London Interbank Offered Rate	0.26%	0.23%

Mortgage Notes Payable (Schedule of Aggregate Principal Payments on Mortgage Notes) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2010 USD ($)
Notes to Financial Statements
2011	$ 471,818
2012	372,929
2013	101,289
2014	125,264
2015	14,312
Thereafter	1,934,278
Unamortized balance of historical fair value adjustments	$ 27,696

Unsecured Senior Notes (Narratives) (Details)	12 Months Ended
Unsecured Senior Notes (Narratives) (Details)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)
Statement [Line Items]
Losses from early extinguishments of debt	$ (89,883,000)	$ (510,000)
Notes outstanding	$ 1,823,694,000
Maximum secured debt leverage ratio	55.00%
Senior Notes Five Point Six Two Five Percent [Member]
Statement [Line Items]
Public offering date	April 19, 2010
Aggregate principal amount	$ 700,000,000
Interest at a fixed rate	5.625%
Note price, percentage of principal amount	99.891%
Yield	5.708%
Maturity date	Nov. 15, 2020
Treasury rate lock agreements	2
Treasury rate lock agreement rate basis, treasury term	10
Fixed treasury interest rate ten year	3.873%
Cash settled, gain on treasury rate lock agreements	$ 400,000
Senior Notes Four Point One Two Five Percent [Member]
Statement [Line Items]
Public offering date	November 18, 2010
Aggregate principal amount	$ 850,000,000
Interest at a fixed rate	4.125%
Note price, percentage of principal amount	99.26%
Yield	4.289%
Maturity date	May 15, 2021
Senior Notes Six Point Two Five Percent [Member]
Statement [Line Items]
Debt instrument, amount repurchased	$ 700,000,000
Interest at a fixed rate	6.25%
Redemption price, percentage of principal amount	110.75%
Treasury rate lock agreements	2
Cash settled, loss on treasury rate lock agreements	$ 2,100,000
Redemption date	Dec. 12, 2010
Accrued and unpaid interest to, but not including, the redemption date	$ 17,900,000
Losses from early extinguishments of debt	79,300,000
Notes outstanding	$ 225,000,000
Senior Notes [Member]
Statement [Line Items]
Maximum leverage ratio	60.00%
Maximum secured debt leverage ratio	50.00%
Minimum interest coverage ratio	1.50
Minimum unencumbered asset value percentage of unsecured debt	150.00%

Unsecured Senior Notes (Unsecured Senior Notes Outstanding Table) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009
Statement [Line Items]
Principal Amount	$ 1,823,694,000
Net discount	(8,402,000)	$ (2,611,000)
Amount due prior to maturity	0
Senior Notes [Member]
Statement [Line Items]
Principal Amount	3,025,000,000
Net discount	$ (8,402,000)
Ten Year Unsecured Senior Notes Six Point Three Eight One Percent [Member]
Statement [Line Items]
Coupon/Stated Rate	6.25%
Effective Rate	6.381%
Maturity Date	Jan. 15, 2013
Principal Amount	$ 182,432,000
Ten Year Unsecured Senior Notes Six Point Two Nine One Percent [Member]
Statement [Line Items]
Coupon/Stated Rate	6.25%
Effective Rate	6.291%
Maturity Date	Jan. 15, 2013
Principal Amount	$ 42,568,000
Twelve Year Unsecured Senior Notes Five Point Six Nine Three Percent [Member]
Statement [Line Items]
Coupon/Stated Rate	5.625%
Effective Rate	5.693%
Maturity Date	Apr. 15, 2015
Principal Amount	$ 300,000,000
Twelve Year Unsecured Senior Notes Five Point One Nine Four Percent [Member]
Statement [Line Items]
Coupon/Stated Rate	5.00%
Effective Rate	5.194%
Maturity Date	Jun. 01, 2015
Principal Amount	$ 250,000,000
Ten Year Unsecured Senior Notes Five Point Nine Six Seven Percent [Member]
Statement [Line Items]
Coupon/Stated Rate	5.875%
Effective Rate	5.967%
Maturity Date	Oct. 15, 2019
Principal Amount	$ 700,000,000
Ten Year Unsecured Senior Notes Five Point Seven Zero Eight Percent [Member]
Statement [Line Items]
Coupon/Stated Rate	5.625%
Effective Rate	5.708%
Maturity Date	Nov. 15, 2020
Principal Amount	$ 700,000,000
Ten Year Unsecured Senior Notes Four Point Two Eight Nine Percent [Member]
Statement [Line Items]
Coupon/Stated Rate	4.125%
Effective Rate	4.289%
Maturity Date	May 15, 2021
Principal Amount	$ 850,000,000

Unsecured Exchangeable Senior Notes (Narratives) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009	Sep. 30, 2009	Jun. 30, 2009	Mar. 31, 2009	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Statement [Line Items]
Net of the adjustment for the equity component allocation	$ 93,628,000								$ 93,628,000
Proceeds attributable to equity component of the notes	230,300,000								230,300,000
Deferred financing costs attributable to equity component	1,000,000								1,000,000
Interest expense									69,000,000	$ 74,400,000	$ 56,400,000
Non cash interest expense									38,300,000	38,600,000	$ 27,800,000
Carrying amount of equity component	228,800,000				$ 229,300,000				228,800,000	229,300,000
Losses from early extinguishments of debt									89,883,000	510,000
Aggregate carrying value of debt component	1,720,000,000				1,900,000,000				1,720,000,000	1,900,000,000
Notes outstanding	1,823,694,000								1,823,694,000
Unsecured exchangeable senior notes	$ 1,721,817,000				$ 1,904,081,000				$ 1,721,817,000	$ 1,904,081,000
Diluted Earnings: Net income, Per Share Amount	$ (0.09)	$ 0.41	$ 0.44	$ 0.38	$ 0.38	$ 0.47	$ 0.53	$ 0.37	$ 1.14	$ 1.76	$ 0.87
ASC 470-20 Adjustment [Member]
Statement [Line Items]
Net of the adjustment for the equity component allocation	$ 93,600,000				$ 140,400,000				$ 93,600,000	$ 140,400,000
Diluted Earnings: Net income, Per Share Amount											$ 0.16
Three Point Six Two Five Percent Exchangeable Senior Notes [Member]
Statement [Line Items]
Value of exchangeable senior notes	$ 747,500,000								$ 747,500,000
Coupon/Stated Rate	3.625%								3.625%
Debt instrument effective interest rate									6.555%
Maturity date									Feb. 15, 2014
Notes outstanding	$ 747,500,000								$ 747,500,000
Two Point Eight Seven Five Percent Exchangeable Senior Notes [Member]
Statement [Line Items]
Value of exchangeable senior notes	$ 862,500,000								$ 862,500,000
Coupon/Stated Rate	2.875%								2.875%
Debt instrument effective interest rate									5.63%
Maturity date									Feb. 15, 2037
Losses from early extinguishments of debt									$ 10,500,000
Notes outstanding	$ 626,194,000								626,194,000
Value of repurchase of senior notes due in 2037									236,300,000
Carrying value of repurchased notes	225,700,000								225,700,000
Two Point Eight Seven Five Percent Exchangeable Senior Notes [Member] \| At Time Of Repurchase [Member]
Statement [Line Items]
Equity value associated with the repurchase of unsecured debt	400,000								400,000
Three Point Seven Five Zero Percent Exchangeable Senior Notes [Member]
Statement [Line Items]
Value of exchangeable senior notes	$ 450,000,000								$ 450,000,000
Coupon/Stated Rate	3.75%								3.75%
Debt instrument effective interest rate									5.958%
Maturity date									May 15, 2036
Notes outstanding	$ 450,000,000								$ 450,000,000

Unsecured Exchangeable Senior Notes (Unsecured Exchangeable Senior Notes Outstanding) (Details)	12 Months Ended
	Dec. 31, 2010 USD ($) $ / shares	Dec. 31, 2007 USD ($) $ / shares	Dec. 17, 2007 $ / shares	Aug. 13, 2010 USD ($)	Dec. 31, 2009 USD ($)
Statement [Line Items]
Total Principal	$ 1,823,694,000
Net Discount	(8,249,000)				$ (15,529,000)
Adjustment for the equity component allocation, net of accumulated amortization	(93,628,000)
Unsecured exchangeable senior notes	$ 1,721,817,000				$ 1,904,081,000
Three Point Six Two Five Percent Exchangeable Senior Notes [Member]
Statement [Line Items]
Coupon/Stated Rate	3.625%
Effective Rate	4.037%
Exchange Rate	8.5051
Total Principal	$ 747,500,000
First optional redemption date	N/A
Maturity date	Feb. 15, 2014
Initial exchange price	$ 1,000
Initial exchange per share	$ 117.58
Revised exchange price due to capped call transaction	137.17
Effective exchange price \| $ / shares	135.85
Premium over closing price	40.00%
Closing price per share of common stock				$ 97.98
Net cost of capped call transaction	$ 44,400,000
Two Point Eight Seven Five Percent Exchangeable Senior Notes [Member]
Statement [Line Items]
Coupon/Stated Rate	2.875%
Effective Rate	3.462%
Exchange Rate	7.0430
Total Principal	$ 626,194,000
First optional redemption date	February 20, 2012(4)
Maturity date	Feb. 15, 2037
Initial exchange price		$ 1,000
Special distribution per share common stock \| $ / shares			$ 5.98
Initial exchange rate		6.6090
Revised exchange rate		7.0430
Revised exchange price resulting from special distribution \| $ / shares		$ 141.98
Repurchase price for the notes	100.00%
Three Point Seven Five Zero Percent Exchangeable Senior Notes [Member]
Statement [Line Items]
Coupon/Stated Rate	3.75%
Effective Rate	3.787%
Exchange Rate	10.0066
Total Principal	$ 450,000,000
First optional redemption date	May 18, 2013(6)
Maturity date	May 15, 2036
Initial exchange price		$ 1,000
Special distribution per share common stock \| $ / shares			$ 5.98
Initial exchange rate		9.3900
Revised exchange rate		10.0066
Revised exchange price resulting from special distribution \| $ / shares		$ 99.93
Repurchase price for the notes	100.00%

Unsecured Line of Credit (Details)	9 Months Ended	12 Months Ended
Unsecured Line of Credit (Details)	Sep. 30, 2010	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Jul. 21, 2008 USD ($)	Jun. 06, 2008 USD ($)
Statement [Line Items]
Variable interest rate Eurodollar basis		0.475%
Original maturity date		Aug. 03, 2010
Length of provision for extension, years		$ 1
Quarterly facility fee percentage		0.125%
Current line of credit amount outstanding		$ 0	$ 0
Weighted-average outstanding balance, line of credit			$ 45,200,000
Line of credit, weighted-average interest rate			0.95%
Line of credit facility terms	div p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;"font style="font-family: Times New Roman;" class="_mt" size="2"The terms of the Unsecured Line of Credit require that the Company maintain a number of customary financial and other covenants on an ongoing basis, including: (1)nbsp;a leverage ratio not to exceed font class="_mt"60/font%, however, thenbsp;leverage ratio may increase to no greater than font class="_mt"65/font% provided that itnbsp;is reduced back to font class="_mt"60/font% withinnbsp;font class="_mt"180/font days, (2)nbsp;a secured debt leverage ratio not to exceed font class="_mt"55/font%, (3)nbsp;a fixed charge coverage ratio of at least font class="_mt"1.40/font, (4)nbsp;an unsecured debt leverage ratio not to exceed font class="_mt"60/font%, however, the unsecured debt leverage ratio may increase to no greater than t;font class="_mt"65/font% provided that itnbsp;is reduced back to font class="_mt"60/font% withinnbsp;font class="_mt"180/font days, (5)nbsp;a minimum net worth requirement, (6)nbsp;an unsecured debt interest coverage ratio of at leastnbsp;font class="_mt"1.75/font and (7)nbsp;limitations on permitted investments, development, partially owned entities, business outside of commercial real estate and commercial non-office properties. At Decembernbsp;31, 2010 and 2009, the Company was in compliance with each of these financial and other covenant requirements. /font/p/div
Maximum leverage ratio		60.00%
Leverage ratio maximum increasing limit		65.00%
Leverage ratio reduction limit		60.00%
Leverage ratio reduction period		180
Maximum secured debt leverage ratio		55.00%
Fixed charge coverage ratio		1.40
Maximum unsecured debt leverage ratio		60.00%
Unsecured debt leverage ratio maximum increasing limit		65.00%
Unsecured debt leverage ratio reduction limit		60.00%
Unsecured debt leverage ratio reduction period		180
Unsecured debt interest coverage ratio		1.75
Line of Credit [Member]
Statement [Line Items]
Maturity date		Aug. 03, 2011
Borrowing Capacity Before Change [Member]
Statement [Line Items]
Current lenders' total commitment				$ 923,300,000	$ 605,000,000
Borrowing Capacity After Change [Member]
Statement [Line Items]
Current lenders' total commitment				$ 1,000,000	$ 923,300,000

Commitments and Contingencies (Narrative) (Details)	12 Months Ended
Commitments and Contingencies (Narrative) (Details)	Dec. 31, 2010 USD ($)
Statement [Line Items]
Letter of credit and performance obligations	$ 27,000,000
Property insurance program per occurrence limits	1,000,000,000
Per occurrence limit for NBCR Coverage	1,000,000,000
Value of program trigger	$ 100,000,000
Coinsurance of program trigger	15.00%
Deduction in insurance as a percentage of the value of the affected property, San Francisco	5.00%
Per occurrence limit of the earthquake insurance which covers San Francisco region	$ 120,000,000
Annual aggregate limit of the earthquake insurance which covers San Francisco region	120,000,000
Amount of earthquake insurance provided by IXP LLC as direct insurer San Francisco	$ 20,000,000
Contractual tax agreements, number of properties	6
Tax protection agreement, expiration date for one property	Jun. 01, 2017
Tax protection agreement, number of properties with expiration date of June 2017	1
Seven Six Seven Venture, LLC [Member]
Statement [Line Items]
Maximum funding obligation	$ 24,000,000
Coverage for acts of terrorism certified under TRIA in excess of amount provided by NYXP, LLC, as a direct insurer	1,375,000,000
Property insurance program per occurrence limits	1,625,000,000
Coverage for acts of terrorism certified under TRIA provided by NYXP, LLC, as a direct insurer	250,000,000
One Two Five West Fifty-Fifth Street Venture LLC [Member]
Statement [Line Items]
Maximum funding obligation	21,300,000
Maximum exposure as of period end	7,200,000
Cash deposit into the escrow account	10,000,000
Escrow account remaining funding obligation	11,300,000
One Freedom Square [Member]
Statement [Line Items]
Guarantee obligation related to tenant re-leasing costs	$ 7,900,000

Noncontrolling Interests (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2008	Dec. 31, 2010
Statement [Line Items]
Reclassification of noncontrolling interests for adoption of ASC 810	$ 6.9
Related To Common Units Of The Operating Partnership Not Owned By The Company [Member]
Statement [Line Items]
Reclassification of noncontrolling interests for adoption of ASC 810	$ 563.2
Noncontrolling Interests [Member]
Statement [Line Items]
Operating Partnership (OP) Units		19,387,871
Long-Term Incentive Plan (LTIP) Units		1,507,164
Outperformance Awards in LTIP (OPP) Units		1,080,938
Series Two Preferred Units		1,113,044
Convertible Operating Partnership (OP) Units		1,460,688

Noncontrolling Interests (Redeemable Preferred Units) (Narrative) (Details)	12 Months Ended
	Dec. 31, 2010 USD ($) $ / shares shares	Dec. 31, 2009 $ / shares shares	Nov. 15, 2010	Aug. 16, 2010	May 17, 2010	May 12, 2010	Feb. 16, 2010	May 12, 2009
Redemption Year Two Thousand Eleven [Member]
Statement [Line Items]
Maximum redeemable Preferred Units	1,007,662
Dates Series Two Preferred holders can require Operating Partnership to redeem their units for cash	May 12, 2011
Series Two Preferred Units redemption price \| $	$ 50
Maximum portion that may be required for redemption of total	0.166666666666667
Redemption Year Two Thousand Twelve [Member]
Statement [Line Items]
Maximum redeemable Preferred Units	1,007,662
Dates Series Two Preferred holders can require Operating Partnership to redeem their units for cash	May 14, 2012
Series Two Preferred Units redemption price \| $	$ 50
Maximum portion that may be required for redemption of total	0.166666666666667
Redemption Year Two Thousand Thirteen [Member]
Statement [Line Items]
Maximum redeemable Preferred Units	1,007,662
Dates Series Two Preferred holders can require Operating Partnership to redeem their units for cash	May 14, 2013
Series Two Preferred Units redemption price \| $	$ 50
Maximum portion that may be required for redemption of total	0.166666666666667
Redemption Year Two Thousand Fourteen [Member]
Statement [Line Items]
Maximum redeemable Preferred Units	1,007,662
Dates Series Two Preferred holders can require Operating Partnership to redeem their units for cash	May 12, 2014
Series Two Preferred Units redemption price \| $	$ 50
Maximum portion that may be required for redemption of total	0.166666666666667
Noncontrolling Interests [Member]
Statement [Line Items]
Series Two Preferred Units	1,113,044
Noncontrolling Interests [Member] \| Series Two Preferred Units [Member]
Statement [Line Items]
Series Two Preferred Units	1,113,044	1,113,044
Option (2) minimum range liquidation preference	5.00%	5.00%
Option (2) maximum range liquidation preference	7.00%	7.00%
Operating Units liquidation preference \| $ / shares	$ 38.10	$ 38.10
OP Units for each Preferred Unit	1.312336	1.312336
Distributions on the Series Two Preferred Units, accrual rate	6.00%							7.00%
Distributions to Series Two Preferred Units			0.75616	0.75616	0.73151		0.75616
Number of holders exercising redemption rights						0		0

Noncontrolling Interests (Redeemable Preferred Units Table) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Notes to Financial Statements
Distributions	$ (3,343)	$ (3,594)	$ (3,738)
Adjustments to reflect redeemable preferred units at redemption value			$ (488)

Noncontrolling Interests (Common Units) (Narrative) (Details) - USD ($)	3 Months Ended					12 Months Ended
	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009	Dec. 31, 2010	Dec. 31, 2009
Statement [Line Items]
OP Units for redemption						591,900	138,856
Dividend paid date		Oct. 29, 2010	Jul. 30, 2010	Apr. 30, 2010	Jan. 29, 2010
Dividend payable date	Jan. 28, 2011					Jan. 28, 2011
Holders of record date	Dec. 31, 2010
Dividends payable, date declared	Dec. 20, 2010
OP Units [Member]
Statement [Line Items]
Outperformance Awards Long Term Incentive Plan Units	1,080,938					1,080,938
Entitlement to receive per unit distributions prior to this date						Feb. 05, 2011
Outperformance Awards Long Term Incentive Plan Units distribution as percentage of OP Unit distribution prior to measurement date						10.00%
Distributions made to OP and LTIP units per unit		$ 0.50	$ 0.50	$ 0.50	$ 0.50
Distribution paid to outperformance awards, OPP Units		$ 0.05	$ 0.05	$ 0.05	$ 0.05
Distribution declared to OP and LTIP units by Boston Properties, Inc.	$ 0.50					$ 0.50
Distribution declared to outperformance awards OPP Units by Boston Properties, Inc.	$ 0.05					$ 0.05
Common units of operating partnership if converted value	$ 1,800,000,000					$ 1,800,000,000
Dividend paid date		Oct. 29, 2010	Jul. 30, 2010	Apr. 30, 2010	Jan. 29, 2010
Value of Series Two Preferred Units assuming conversion	$ 125,800,000					$ 125,800,000
Holders of record date		Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009
Restriction on redemption of OP Unit to Common Stock, years						1
Redemption of OP Unit equivalence to Common Stock						1
Noncontrolling Interests [Member]
Statement [Line Items]
Outperformance Awards Long Term Incentive Plan Units	1,080,938					1,080,938
Noncontrolling Interests [Member] \| Series Two Preferred Units [Member]
Statement [Line Items]
Closing price of common stock	$ 86.10					$ 86.10

Noncontrolling Interests (Property Partnerships) (Narrative) (Details) - Wisconsin Place Office [Member] $ in Millions	12 Months Ended
	Dec. 31, 2010 USD ($)
Statement [Line Items]
Ownership percentage	33.30%
Difference between the purchase price and the carrying value of the outside member's equity interest	$ 19.1

Stockholders' Equity (Narrative) (Details) $ / shares in Units, $ in Millions	3 Months Ended						12 Months Ended
	Mar. 31, 2011 USD ($)	Dec. 31, 2010 $ / shares shares	Sep. 30, 2010 $ / shares	Jun. 30, 2010 $ / shares	Mar. 31, 2010 $ / shares	Dec. 31, 2009 $ / shares shares	Dec. 31, 2010 USD ($) $ / shares shares
Notes to Financial Statements
Common stock, shares outstanding \| shares		140,199,105				138,880,010	140,199,105
Dividend paid date			Oct. 29, 2010	Jul. 30, 2010	Apr. 30, 2010	Jan. 29, 2010
Dividend paid on common stock \| $ / shares			$ 0.50	$ 0.50	$ 0.50	$ 0.50
Dividend shareholder of record date		Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009
Dividends payable, date declared		Dec. 20, 2010
Dividends payable, amount per share \| $ / shares		$ 0.50					$ 0.50
Dividend payable date		Jan. 28, 2011					Jan. 28, 2011
At the market stock offering program, aggregate value of common stock \| $	$ 400.0						$ 400.0
At the market stock offering program maximum length of sale (years)	3						3
Shares of its Common Stock in connection with the redemption of an equal number of OP Units \| shares		591,900				138,856	591,900

Future Minimum Rents (Details)	12 Months Ended
Future Minimum Rents (Details)	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Notes to Financial Statements
Maximum percent of revenue generated from single renter	10.00%	10.00%	10.00%
Number of tenants above concentration amount	0	0	0

Segment Reporting (Segment Reporting by Geographic Area and Property Type) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Statement [Line Items]
Rental Revenue: Class A Office	$ 1,430,588,000	$ 1,406,042,000	$ 1,355,963,000
Rental Revenue: Office/Technical	$ 46,185,000	$ 46,885,000	$ 46,089,000
Rental Revenue: % of Grand Totals	100.00%	100.00%	100.00%
Real Estate Operating Expenses: Class A Office	$ 488,459,000	$ 488,002,000	$ 474,697,000
Real Estate Operating Expenses: Office/Technical	13,235,000	13,797,000	13,333,000
Real Estate Operating Expenses: Hotels	25,153,000	23,966,000	27,510,000
Real Estate Operating Expenses: Total	$ 526,847,000	$ 525,765,000	$ 515,540,000
Real Estate Operating Expenses: % of Grand Totals	100.00%	100.00%	100.00%
Net Operating Income: % of Grand Totals	100.00%	100.00%	100.00%
Greater Boston [Member]
Statement [Line Items]
Rental Revenue: Class A Office	$ 368,841,000	$ 364,064,000	$ 360,468,000
Rental Revenue: Office/Technical	$ 30,336,000	$ 30,655,000	$ 30,634,000
Rental Revenue: % of Grand Totals	28.62%	28.66%	29.74%
Real Estate Operating Expenses: Class A Office	$ 138,722,000	$ 137,785,000	$ 139,448,000
Real Estate Operating Expenses: Office/Technical	9,067,000	9,475,000	9,650,000
Real Estate Operating Expenses: Hotels	25,153,000	23,966,000	27,510,000
Real Estate Operating Expenses: Total	$ 172,942,000	$ 171,226,000	$ 176,608,000
Real Estate Operating Expenses: % of Grand Totals	32.83%	32.57%	34.26%
Net Operating Income: % of Grand Totals	26.36%	26.51%	27.22%
Greater Washington, DC [Member]
Statement [Line Items]
Rental Revenue: Class A Office	$ 335,508,000	$ 318,786,000	$ 282,166,000
Rental Revenue: Office/Technical	$ 15,849,000	$ 16,230,000	$ 15,455,000
Rental Revenue: % of Grand Totals	23.27%	22.58%	20.68%
Real Estate Operating Expenses: Class A Office	$ 92,892,000	$ 93,799,000	$ 82,227,000
Real Estate Operating Expenses: Office/Technical	4,168,000	4,322,000	3,683,000
Real Estate Operating Expenses: Total	$ 97,060,000	$ 98,121,000	$ 85,910,000
Real Estate Operating Expenses: % of Grand Totals	18.42%	18.66%	16.66%
Net Operating Income: % of Grand Totals	25.88%	24.74%	22.93%
Midtown Manhattan [Member]
Statement [Line Items]
Rental Revenue: Class A Office	$ 445,296,000	$ 441,571,000	$ 435,219,000
Rental Revenue: % of Grand Totals	29.50%	29.77%	30.25%
Real Estate Operating Expenses: Class A Office	$ 146,381,000	$ 146,398,000	$ 142,764,000
Real Estate Operating Expenses: Total	$ 146,381,000	$ 146,398,000	$ 142,764,000
Real Estate Operating Expenses: % of Grand Totals	27.78%	27.84%	27.69%
Net Operating Income: % of Grand Totals	30.42%	30.83%	31.67%
Greater San Francisco [Member]
Statement [Line Items]
Rental Revenue: Class A Office	$ 215,468,000	$ 218,432,000	$ 214,202,000
Rental Revenue: % of Grand Totals	14.27%	14.73%	14.89%
Real Estate Operating Expenses: Class A Office	$ 78,978,000	$ 80,269,000	$ 79,553,000
Real Estate Operating Expenses: Total	$ 78,978,000	$ 80,269,000	$ 79,553,000
Real Estate Operating Expenses: % of Grand Totals	14.99%	15.27%	15.43%
Net Operating Income: % of Grand Totals	13.89%	14.43%	14.58%
New Jersey [Member]
Statement [Line Items]
Rental Revenue: Class A Office	$ 65,475,000	$ 63,189,000	$ 63,908,000
Rental Revenue: % of Grand Totals	4.34%	4.26%	4.44%
Real Estate Operating Expenses: Class A Office	$ 31,486,000	$ 29,751,000	$ 30,705,000
Real Estate Operating Expenses: Total	$ 31,486,000	$ 29,751,000	$ 30,705,000
Real Estate Operating Expenses: % of Grand Totals	5.98%	5.66%	5.96%
Net Operating Income: % of Grand Totals	3.45%	3.49%	3.60%

Segment Reporting (Reconciliation of Net Operating Income to Net Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Statement [Line Items]
Income (loss) from unconsolidated joint ventures	$ 36,774	$ 12,058	$ (182,018)
Interest and other income	7,332	4,059	18,958
Gains (losses) from investments in securities	935	2,434	(4,604)
Gains on sales of real estate	2,734	11,760	33,340
General and administrative expense	79,658	75,447	72,365
Acquisition costs expensed	2,614
Depreciation and amortization expense	338,371	321,681	304,147
Interest expense	378,079	322,833	295,322
Losses from early extinguishments of debt	89,883	510
Net derivative losses			(17,021)
Noncontrolling interest in gains on sales of real estate-common units of the Operating Partnership	349	1,579	4,838
Business Intersegment, Eliminations [Member]
Statement [Line Items]
Development and management services	41,231	34,878	30,518
Income (loss) from unconsolidated joint ventures	36,774	12,058	(182,018)
Interest and other income	7,332	4,059	18,958
Gains (losses) from investments in securities	935	2,434	(4,604)
Gains on sales of real estate	2,734	11,760	33,340
General and administrative expense	79,658	75,447	72,365
Acquisition costs expensed	2,614
Depreciation and amortization expense	338,371	321,681	304,147
Interest expense	378,079	322,833	295,322
Losses from early extinguishments of debt	89,883	510
Net derivative losses			17,021
Noncontrolling interest in gains on sales of real estate-common units of the Operating Partnership	$ 349	$ 1,579	$ 4,838

Earnings Per Share (Computation of basic and diluted earnings per share) (Details) shares in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2010 $ / shares	Sep. 30, 2010 $ / shares	Jun. 30, 2010 $ / shares	Mar. 31, 2010 $ / shares	Dec. 31, 2009 $ / shares	Sep. 30, 2009 $ / shares	Jun. 30, 2009 $ / shares	Mar. 31, 2009 $ / shares	Dec. 31, 2010 USD ($) $ / shares shares	Dec. 31, 2009 USD ($) $ / shares shares	Dec. 31, 2008 USD ($) $ / shares shares
Notes to Financial Statements
Net income attributable to Boston Properties Inc., Per Share Amount	$ (0.09)	$ 0.41	$ 0.44	$ 0.38	$ 0.38	$ 0.47	$ 0.54	$ 0.37	$ 1.14	$ 1.76	$ 0.88
Stock Based Compensation, Income (Numerator) \| $
Stock Based Compensation, Shares (Denominator) \| shares									617	462	1,319
Stock Based Compensation, Per Share Amount									0.00	0.00	(0.01)
Diluted Earnings: Net income, Per Share Amount	$ (0.09)	$ 0.41	$ 0.44	$ 0.38	$ 0.38	$ 0.47	$ 0.53	$ 0.37	$ 1.14	$ 1.76	$ 0.87

Employee Benefit Plans (Narrative) (Details)	12 Months Ended			120 Months Ended	132 Months Ended	180 Months Ended
Employee Benefit Plans (Narrative) (Details)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2008 USD ($)	Dec. 31, 2010 USD ($) years	Dec. 31, 2010 USD ($)	Dec. 31, 1999
Notes to Financial Statements
Matching Contribution Percent, 401 K					200.00%	200.00%
Eligibility period for 401K savings plan (months)	3
Participants maximum matching contribution, percent					3.00%	2.00%
Maximum eligible earnings as established by the IRS for matching contributions	$ 245,000	$ 245,000	$ 230,000
Annual aggregate matching contributions, Total	2,900,000	3,000,000	2,700,000
Years of service for supplemental retirement contribution \| years				10
Age of employee for supplemental retirement contribution \| years				40
Annual supplemental retirement contribution and credit, Total	48,000	122,000	$ 210,000
Separate unrestricted cash for deferred compensation plan	8,700,000	9,900,000		$ 8,700,000	$ 8,700,000
Actual liability for deferred compensation plan	$ 8,700,000	$ 9,800,000		$ 8,700,000	$ 8,700,000

Stock Option and Incentive Plan and Stock Purchase Plan (Narrative) (Details)	12 Months Ended
	Dec. 31, 2010 USD ($) years shares	Feb. 05, 2008 USD ($) years	Jan. 24, 2008 years	May 15, 2007 shares
Statement [Line Items]
Stock option and incentive plan 1997 end date	May 15, 2017
Number of common stock shares available for issuance \| shares				4,019,174
Number of shares available for grant other than stock options \| shares	1,122,204
OPP Units Two Thousand And Eight [Member]
Statement [Line Items]
Award additional vesting period \| years	2
Start of the measurement period	Feb. 05, 2008
End of the measurement period	Feb. 05, 2011
Trading days prior to February 5, 2008 \| years		5
TRS measurement, years \| years		3	3
Average closing price of common stock \| $		$ 92.8240
Aggregate rewards of OPP awards, maximum cap \| $	$ 110,000,000
Aggregate rewards of OPP awards granted \| $	$ 104,800,000

Stock Option and Incentive Plan and Stock Purchase Plan (Restricted Stock) (Narrative) (Details) $ / shares in Units, $ in Thousands	12 Months Ended			48 Months Ended
	Dec. 31, 2010 USD ($) $ / shares shares	Dec. 31, 2009 USD ($) $ / shares shares	Dec. 31, 2008 USD ($) $ / shares shares	Dec. 31, 2009 USD ($) $ / shares shares	Mar. 31, 2011 USD ($) shares
Statement [Line Items]
Shares issued \| shares	140,278,005	138,958,910		138,958,910
LTIP units issued \| shares					184,416
OPP units issued \| shares			1,085,861
Stock based compensation associated with restricted stock, LTIP Units, and 2008 OPP Units	$ 31,900	$ 25,600	$ 22,100
Accelerated amount of unvested compensation expense				$ 5,800
Unrecognized compensation expenses related to unvested restricted stock and LTIP units	$ 27,700
Share based compensation measurement period (years)	3
Unrecognized compensation expense, remaining					$ 4,300
Value of shares of common stock	$ 1,402	1,389		$ 1,389
Value of LTIP units issued	$ 15,300	$ 21,100	$ 25,400
Per unit fair value weighted-average \| $ / shares	$ 60.49	$ 41.05	$ 88.08	$ 41.05
Number of days used in calculation, average closing prices of common stock	10
OPP Units Two Thousand And Eight [Member]
Statement [Line Items]
Unrecognized compensation expenses related to unvested 2008 OPP units	$ 4,400
Weighted-average period (years)	2.0
Value of 2008 OPP units	$ 19,700
Restricted Stock [Member]
Statement [Line Items]
Shares issued \| shares	69,499	62,876	4,723	62,876	17,795
Employee and director payment per share	0.01
Value of shares of common stock	$ 4,500	$ 2,800	$ 500	$ 2,800
Employee's cost per share \| $ / shares	$ 65.31	$ 43.89	$ 96.09	$ 43.89
LTIP Units [Member]
Statement [Line Items]
LTIP units issued \| shares	252,597	515,007	288,507	515,007
LTIP and Restricted Stock [Member]
Statement [Line Items]
Vesting annual installments	4
LTIPs and OPP Awards [Member]
Statement [Line Items]
Employee and director payment per share	0.25

Related Party Transactions (Details)	12 Months Ended
Related Party Transactions (Details)	Dec. 31, 2010 USD ($) sqft	Dec. 31, 2009	Dec. 31, 2004 USD ($)	Dec. 31, 1998 USD ($)
Statement [Line Items]
Deferred stock units outstanding	73,218	87,302
Director [Member]
Statement [Line Items]
Percent of Turchin and Turchin & Associates owned	95.00%
Former Director [Member]
Statement [Line Items]
Annual development agreement payments	$ 125,000
Development agreement payment made for 1998 through 2004			$ 750,000
Year term of development agreement (years)				20
Acquisition date	39287
Son Of Director [Member]
Statement [Line Items]
Percent of Turchin and Turchin & Associates owned	5.00%
Affiliate of Former Director [Member]
Statement [Line Items]
Square feet of development \| sqft	2,000,000
Purchase price per rentable square feet of property developed	$ 20			$ 20
Stabilized annual return percentage minimum				10.50%
Stabilized annual return percentage maximum				11.00%
Aggregate fixed rentable per square foot of developed property			10.50
Adjustment to aggregated fixed amount per square foot of developed property			$ 5.5

Selected Interim Financial Information (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009	Sep. 30, 2009	Jun. 30, 2009	Mar. 31, 2009	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Notes to Financial Statements
Income from continuing operations	$ (12,756)	$ 68,089	$ 71,518	$ 60,742	$ 60,668	$ 75,256	$ 75,580	$ 51,235	$ 187,593	$ 262,739	$ 97,383
Income attributable to Boston Properties, Inc. per share-basic	$ (0.09)	$ 0.41	$ 0.44	$ 0.38	$ 0.38	$ 0.47	$ 0.54	$ 0.37	$ 1.14	$ 1.76	$ 0.88
Income attributable to Boston Properties, Inc. per share-diluted	$ (0.09)	$ 0.41	$ 0.44	$ 0.38	$ 0.38	$ 0.47	$ 0.53	$ 0.37	$ 1.14	$ 1.76	$ 0.87

Subsequent Events (Details)	3 Months Ended	12 Months Ended
Subsequent Events (Details)	Mar. 31, 2011 USD ($) shares	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($) years shares	Feb. 01, 2016	Feb. 01, 2015	Feb. 01, 2014	Feb. 21, 2011 USD ($)	Feb. 05, 2011 $ / shares	Feb. 01, 2011 USD ($)	Jan. 14, 2011	Dec. 31, 2009 shares	Dec. 31, 2008 shares	Feb. 05, 2008 USD ($) years	Jan. 24, 2008 years
Statement [Line Items]
Amount repaid to employees for 2008 OPP units \| $ / shares											$ 0.25
Shares issued \| shares						140,278,005								138,958,910
LTIP units issued \| shares	184,416
Non-qualified stock options issued \| shares	146,844
At the market stock offering program, aggregate value of common stock	$ 400,000,000					$ 400,000,000
At the market stock offering program maximum length of sale (years)	3					3
At the market stock offering program, shares issued \| shares	2,304,994
At the market stock offering program, gross proceeds	$ 219,000,000
Atlantic Wharf Development in Boston [Member]
Statement [Line Items]
Atlantic Wharf development placed in-service (percentage)													57.00%
Net rentable square feet					790,000
Office property percentage leased					79.00%
Bay Colony Corporate Center [Member]
Statement [Line Items]
Net rentable square feet					1,000,000
Acquisition aggregate purchase price					$ 185,000,000
Cash portion of purchase price												$ 41,100,000
Interest at a fixed rate					6.53%
Maturity date					Jun. 11, 2012	Jun. 11, 2012
Number of buildings in acquisition					4
Area of land acquisition					58
OPP Units Two Thousand And Eleven [Member]
Statement [Line Items]
Measurement period for 2011 OPP Awards						Februarynbsp;1, 2011 to Januarynbsp;31, 2014
Aggregate rewards of OPP awards, maximum cap						$ 40,000,000
Amortization into earnings period (years)					5
TRS measurement, years					3	3
Cumulative absolute TRS hurdle						27.00%
Cumulative absolute TRS hurdle, annum						9.00%
Relative TRS component percentage						two
Vesting percentage for 2011 OPP Awards							50.00%	25.00%	25.00%
Vesting date		Feb. 01, 2016	Feb. 01, 2015	Feb. 01, 2014
Performance measurement period, days					15
Distribution percentage before measurement date					10.00%
LTIP and common units equivalency ratio					font class="_mt"one-for-one/font
TRS Component Sliding Scale One [Member] \| OPP Units Two Thousand And Eleven [Member]
Statement [Line Items]
TRS measurement, years						3
Cumulative absolute TRS hurdle						27.00%
Percentage of the potential relative TRS component earned if the Company's TRS is equal to or greater than a cumulative 27% over three years						100
TRS Component Sliding Scale Two [Member] \| OPP Units Two Thousand And Eleven [Member]
Statement [Line Items]
Cumulative absolute TRS hurdle, annum						0.00%
Percentage earned if the Company's TRS is 0% or less						0.00%
TRS Component Sliding Scale Three [Member] \| OPP Units Two Thousand And Eleven [Member]
Statement [Line Items]
TRS measurement, years						3
Cumulative absolute TRS hurdle						27.00%
Cumulative absolute TRS hurdle, annum						0.00%
Percentage calculated by linear interpolation earned if the Company's cumulative TRS over three years is between 0% and 27%, minimum						0.00%
Percentage calculated by linear interpolation earned if the Company's cumulative TRS over three years is between 0% and 27%, maximum						100.00%
TRS Component Hypothetical Situation [Member] \| OPP Units Two Thousand And Eleven [Member]
Statement [Line Items]
TRS measurement, years						3
Cumulative absolute TRS hurdle						18.00%
Cumulative absolute TRS hurdle, annum						6.00%
Potential relative TRS component proration percentage						66.67%
OPP Units Two Thousand And Eleven [Member]
Statement [Line Items]
Average closing price of common stock for five trading days prior and including February 1, 2011										$ 93.38
Aggregate rewards of OPP awards, maximum cap					$ 40,000,000
Aggregate value Of 2011 OPP Awards					$ 7,800,000
Excess total return above a cumulative absolute TRS hurdle						2.00%
TRS measurement, years					3	3
Cumulative absolute TRS hurdle						27.00%
Cumulative absolute TRS hurdle, annum						9.00%
Award additional vesting period					2
Trading days prior to February 1, 2011												5
OPP Units Two Thousand And Eight [Member]
Statement [Line Items]
Average closing price of common stock for five trading days prior and including February 1, 2011																$ 92.8240
Aggregate rewards of OPP awards, maximum cap						$ 110,000,000
TRS measurement, years \| years																3	3
Award additional vesting period \| years						2
Distribution percentage before measurement date						10.00%
Restricted Stock [Member]
Statement [Line Items]
Shares issued \| shares	17,795					69,499								62,876	4,723

Real Estate and Accumulated Depreciation (Table) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009
Statement [Line Items]
Land Held for Development	$ 757,556	$ 718,525
Development and Construction in Progress	1,073,402	$ 563,645
Real estate aggregate cost for tax purposes	10,400,000
Real estate aggregate accumulated depreciation for tax purposes	$ 2,000,000
Property plant and equipment useful life	font class="_mt"the life of the lease/font
Unamortized balance of historical fair value adjustments	$ 27,696
Embarcadero Center [Member]
Statement [Line Items]
Type	Office
Location	San Francisco, CA
Depreciable Lives (Years)	(1)
Three Nine Nine Park Avenue [Member]
Statement [Line Items]
Type	Office
Location	New York, NY
Depreciable Lives (Years)	(1)
Prudential Center [Member]
Statement [Line Items]
Type	Office
Location	Boston, MA
Land Held for Development	$ 15,487
Depreciable Lives (Years)	(1)
Six Zero One Lexington Avenue [Member]
Statement [Line Items]
Type	Office
Location	New York, NY
Depreciable Lives (Years)	(1)
John Hancock Tower and Garage in Boston [Member]
Statement [Line Items]
Type	Office
Location	Boston, MA
Depreciable Lives (Years)	(1)
Times Square Tower [Member]
Statement [Line Items]
Type	Office
Location	New York, NY
Depreciable Lives (Years)	(1)
Carnegie Center [Member]
Statement [Line Items]
Type	Office
Location	Princeton, NJ
Land Held for Development	$ 1,795
Depreciable Lives (Years)	(1)
Five Nine Nine Lexington Avenue [Member]
Statement [Line Items]
Type	Office
Location	New York, NY
Depreciable Lives (Years)	(1)
Gateway Center [Member]
Statement [Line Items]
Type	Office
Location	San Francisco, CA
Depreciable Lives (Years)	(1)
South Of Market [Member]
Statement [Line Items]
Type	Office
Location	Reston, VA
Depreciable Lives (Years)	(1)
Reservoir Place [Member]
Statement [Line Items]
Type	Office
Location	Waltham, MA
Depreciable Lives (Years)	(1)
Three Two Zero Zero Zanker Road [Member]
Statement [Line Items]
Type	Office
Location	San Jose, CA
Land Held for Development	$ 1,201
Depreciable Lives (Years)	(1)
One Three Three Three New Hampshire Avenue [Member]
Statement [Line Items]
Type	Office
Location	Washington, DC
Depreciable Lives (Years)	(1)
Kingstowne Towne Center [Member]
Statement [Line Items]
Type	Office
Location	Alexandria, VA
Depreciable Lives (Years)	(1)
Five Zero Five Ninth Street [Member]
Statement [Line Items]
Type	Office
Location	Washington, DC
Depreciable Lives (Years)	(1)
One Three Three Zero Connecticut Avenue [Member]
Statement [Line Items]
Type	Office
Location	Washington, DC
Depreciable Lives (Years)	(1)
Weston Corporate Center [Member]
Statement [Line Items]
Type	Office
Location	Weston, MA
Depreciable Lives (Years)	(1)
Capital Gallery [Member]
Statement [Line Items]
Type	Office
Location	Washington, DC
Depreciable Lives (Years)	(1)
Six Three Five Massachusetts Avenue [Member]
Statement [Line Items]
Type	Office
Location	Washington, DC
Development and Construction in Progress	$ 15
Depreciable Lives (Years)	(1)
One Freedom Square [Member]
Statement [Line Items]
Type	Office
Location	Reston, VA
Depreciable Lives (Years)	(1)
Two Freedom Square [Member]
Statement [Line Items]
Type	Office
Location	Reston, VA
Depreciable Lives (Years)	(1)
Seven Cambridge Center [Member]
Statement [Line Items]
Type	Office
Location	Cambridge, MA
Depreciable Lives (Years)	(1)
One and Two Reston Overlook [Member]
Statement [Line Items]
Type	Office
Location	Reston, VA
Depreciable Lives (Years)	(1)
One Four Zero Kendrick Street [Member]
Statement [Line Items]
Type	Office
Location	Needham, MA
Depreciable Lives (Years)	(1)
Discovery Square [Member]
Statement [Line Items]
Type	Office
Location	Reston, VA
Depreciable Lives (Years)	(1)
One Two Three One Zero Sunrise Valley Drive [Member]
Statement [Line Items]
Type	Office
Location	Reston, VA
Development and Construction in Progress	$ 290
Depreciable Lives (Years)	(1)
Waltham Weston Corporate Center [Member]
Statement [Line Items]
Type	Office
Location	Waltham, MA
Depreciable Lives (Years)	(1)
Five Cambridge Center [Member]
Statement [Line Items]
Type	Office
Location	Cambridge, MA
Depreciable Lives (Years)	(1)
One Two Three Zero Zero Sunrise Valley Drive [Member]
Statement [Line Items]
Type	Office
Location	Reston, VA
Land Held for Development	$ 1,139
Depreciable Lives (Years)	(1)
Seven Seven City Point [Member]
Statement [Line Items]
Type	Office
Location	Waltham, MA
Depreciable Lives (Years)	(1)
Four Cambridge Center [Member]
Statement [Line Items]
Type	Office
Location	Cambridge, MA
Depreciable Lives (Years)	(1)
Democracy Tower [Member]
Statement [Line Items]
Type	Office
Location	Reston, VA
Depreciable Lives (Years)	(1)
Two Three Zero City Point [Member]
Statement [Line Items]
Type	Office
Location	Waltham, MA
Depreciable Lives (Years)	(1)
North First Business Park [Member]
Statement [Line Items]
Type	Office
Location	San Jose, CA
Land Held for Development	$ 35,710
Depreciable Lives (Years)	(1)
Reston Corporate Center [Member]
Statement [Line Items]
Type	Office
Location	Reston, VA
Depreciable Lives (Years)	(1)
Wisconsin Place [Member]
Statement [Line Items]
Type	Office
Location	Chevy Chase, MD
Depreciable Lives (Years)	(1)
New Dominion Technology Park, Bldg. Two [Member]
Statement [Line Items]
Type	Office
Location	Herndon, VA
Depreciable Lives (Years)	(1)
One Preserve Parkway [Member]
Statement [Line Items]
Type	Office
Location	Rockville, MD
Depreciable Lives (Years)	(1)
One Nine One Spring Street [Member]
Statement [Line Items]
Type	Office
Location	Lexington, MA
Depreciable Lives (Years)	(1)
New Dominion Technology Park, Bldg. One [Member]
Statement [Line Items]
Type	Office
Location	Herndon, VA
Depreciable Lives (Years)	(1)
Three Zero Three Almaden Boulevard [Member]
Statement [Line Items]
Type	Office
Location	San Jose, CA
Depreciable Lives (Years)	(1)
One Three Zero One New York Avenue [Member]
Statement [Line Items]
Type	Office
Location	Washington, DC
Depreciable Lives (Years)	(1)
Sumner Square [Member]
Statement [Line Items]
Type	Office
Location	Washington, DC
Depreciable Lives (Years)	(1)
Two Zero Zero West Street [Member]
Statement [Line Items]
Type	Office
Location	Waltham, MA
Depreciable Lives (Years)	(1)
University Place [Member]
Statement [Line Items]
Type	Office
Location	Cambridge, MA
Depreciable Lives (Years)	(1)
Bedford Business Park [Member]
Statement [Line Items]
Type	Office
Location	Bedford, MA
Depreciable Lives (Years)	(1)
Two Six Zero Zero Tower Oaks Boulevard [Member]
Statement [Line Items]
Type	Office
Location	Rockville, MD
Depreciable Lives (Years)	(1)
Quorum Office Park [Member]
Statement [Line Items]
Type	Office
Location	Chelmsford, MA
Depreciable Lives (Years)	(1)
One Two Two Nine Zero Sunrise Valley Drive [Member]
Statement [Line Items]
Type	Office
Location	Reston, VA
Depreciable Lives (Years)	(1)
One Cambridge Center [Member]
Statement [Line Items]
Type	Office
Location	Cambridge, MA
Depreciable Lives (Years)	(1)
Five Zero Zero E Street [Member]
Statement [Line Items]
Type	Office
Location	Washington, DC
Depreciable Lives (Years)	(1)
Eight Cambridge Center [Member]
Statement [Line Items]
Type	Office
Location	Cambridge, MA
Depreciable Lives (Years)	(1)
One Zero And Two Zero Burlington Mall Road [Member]
Statement [Line Items]
Type	Office
Location	Burlington, MA
Depreciable Lives (Years)	(1)
Ten Cambridge Center [Member]
Statement [Line Items]
Type	Office
Location	Cambridge, MA
Depreciable Lives (Years)	(1)
Two Zero One Spring Street [Member]
Statement [Line Items]
Type	Office
Location	Lexington, MA
Depreciable Lives (Years)	(1)
Montvale Center [Member]
Statement [Line Items]
Type	Office
Location	Gaithersburg, MD
Depreciable Lives (Years)	(1)
Four Zero Shattuck Road [Member]
Statement [Line Items]
Type	Office
Location	Andover, MA
Depreciable Lives (Years)	(1)
Lexington Office Park [Member]
Statement [Line Items]
Type	Office
Location	Lexington, MA
Depreciable Lives (Years)	(1)
Three Cambridge Center [Member]
Statement [Line Items]
Type	Office
Location	Cambridge, MA
Depreciable Lives (Years)	(1)
Six Six Zero One And Six Six Zero Five Springfield Center Drive [Member]
Statement [Line Items]
Type	Office
Location	Springfield, VA
Land Held for Development	$ 10,089
Depreciable Lives (Years)	(1)
One Zero Three Fourth Avenue [Member]
Statement [Line Items]
Type	Office
Location	Waltham, MA
Depreciable Lives (Years)	(1)
Nine Two Through One Zero Zero Hayden Avenue [Member]
Statement [Line Items]
Type	Office
Location	Lexington, MA
Depreciable Lives (Years)	(1)
One Eight One Spring Street [Member]
Statement [Line Items]
Type	Office
Location	Lexington, MA
Depreciable Lives (Years)	(1)
Waltham Office Center [Member]
Statement [Line Items]
Type	Office
Location	Waltham, MA
Land Held for Development	$ 2,641
Depreciable Lives (Years)	(1)
Nine One Hartwell Avenue [Member]
Statement [Line Items]
Type	Office
Location	Lexington, MA
Depreciable Lives (Years)	(1)
One Nine Five West Street [Member]
Statement [Line Items]
Type	Office
Location	Waltham, MA
Depreciable Lives (Years)	(1)
Seven Five Zero One Boston Boulevard, Building Seven [Member]
Statement [Line Items]
Type	Office
Location	Springfield, VA
Depreciable Lives (Years)	(1)
Eleven Cambridge Center [Member]
Statement [Line Items]
Type	Office
Location	Cambridge, MA
Depreciable Lives (Years)	(1)
Three Three Hayden Avenue [Member]
Statement [Line Items]
Type	Office
Location	Lexington, MA
Depreciable Lives (Years)	(1)
Seven Four Three Five Boston Boulevard, Building One [Member]
Statement [Line Items]
Type	Office
Location	Springfield, VA
Depreciable Lives (Years)	(1)
Seven Four Five Zero Boston Boulevard, Building Three [Member]
Statement [Line Items]
Type	Office
Location	Springfield, VA
Depreciable Lives (Years)	(1)
Eight Zero Zero Zero Grainger Court, Building Five [Member]
Statement [Line Items]
Type	Office
Location	Springfield, VA
Depreciable Lives (Years)	(1)
Seven Five Zero Zero Boston Boulevard, Building Six [Member]
Statement [Line Items]
Type	Office
Location	Springfield, VA
Depreciable Lives (Years)	(1)
Seven Six Zero One Boston Boulevard, Building Eight [Member]
Statement [Line Items]
Type	Office
Location	Springfield, VA
Depreciable Lives (Years)	(1)
Fourteen Cambridge Center [Member]
Statement [Line Items]
Type	Office
Location	Cambridge, MA
Depreciable Lives (Years)	(1)
Seven Three Zero Zero Boston Boulevard, Building Thirteen [Member]
Statement [Line Items]
Type	Office
Location	Springfield, VA
Depreciable Lives (Years)	(1)
Eight Zero Zero Zero Corporate Court, Building Eleven [Member]
Statement [Line Items]
Type	Office
Location	Springfield, VA
Depreciable Lives (Years)	(1)
Seven Three Seven Five Boston Boulevard, Building Ten [Member]
Statement [Line Items]
Type	Office
Location	Springfield, VA
Depreciable Lives (Years)	(1)
Seven Three Seven Four Boston Boulevard, Building Four [Member]
Statement [Line Items]
Type	Office
Location	Springfield, VA
Depreciable Lives (Years)	(1)
Three Two Hartwell Avenue [Member]
Statement [Line Items]
Type	Office
Location	Lexington, MA
Depreciable Lives (Years)	(1)
Seven Four Five One Boston Boulevard, Building Two [Member]
Statement [Line Items]
Type	Office
Location	Springfield, VA
Depreciable Lives (Years)	(1)
One Six Four Lexington Road [Member]
Statement [Line Items]
Type	Office
Location	Billerica, MA
Depreciable Lives (Years)	(1)
One Seven Hartwell Avenue [Member]
Statement [Line Items]
Type	Office
Location	Lexington, MA
Depreciable Lives (Years)	(1)
Cambridge Center Marriott [Member]
Statement [Line Items]
Type	Hotel
Location	Cambridge, MA
Depreciable Lives (Years)	(1)
Cambridge Center East Garage [Member]
Statement [Line Items]
Type	Garage
Location	Cambridge, MA
Depreciable Lives (Years)	(1)
Cambridge Center West Garage [Member]
Statement [Line Items]
Type	Garage
Location	Cambridge, MA
Depreciable Lives (Years)	(1)
Cambridge Center North Garage [Member]
Statement [Line Items]
Type	Garage
Location	Cambridge, MA
Depreciable Lives (Years)	(1)
Atlantic Wharf [Member]
Statement [Line Items]
Type	Development
Location	Boston, MA
Development and Construction in Progress	$ 525,894
Depreciable Lives (Years)	N/A
Five One Zero Madison Avenue [Member]
Statement [Line Items]
Type	Development
Location	New York, NY
Development and Construction in Progress	$ 317,055
Depreciable Lives (Years)	N/A
Two Two Zero Zero Pennsylvania Avenue [Member]
Statement [Line Items]
Type	Development
Location	Washington, DC
Development and Construction in Progress	$ 230,148
Depreciable Lives (Years)	N/A
Two Five Zero West Fifty-Fifth Street [Member]
Statement [Line Items]
Type	Land
Location	New York, NY
Land Held for Development	$ 475,780
Depreciable Lives (Years)	N/A
Plaza at Almaden [Member]
Statement [Line Items]
Type	Land
Location	San Jose, CA
Land Held for Development	$ 37,306
Depreciable Lives (Years)	N/A
Springfield Metro Center [Member]
Statement [Line Items]
Type	Land
Location	Springfield, VA
Land Held for Development	$ 30,408
Depreciable Lives (Years)	N/A
Tower Oaks Master Plan [Member]
Statement [Line Items]
Type	Land
Location	Rockville, MD
Land Held for Development	$ 28,332
Depreciable Lives (Years)	N/A
Prospect Hill [Member]
Statement [Line Items]
Type	Land
Location	Waltham, MA
Land Held for Development	$ 23,304
Depreciable Lives (Years)	N/A
Reston Land [Member]
Statement [Line Items]
Type	Land
Location	Reston, VA
Land Held for Development	$ 20,949
Depreciable Lives (Years)	N/A
Washingtonian North [Member]
Statement [Line Items]
Type	Land
Location	Gaithersburg, MD
Land Held for Development	$ 17,644
Depreciable Lives (Years)	N/A
One Seven Cambridge Center [Member]
Statement [Line Items]
Type	Land
Location	Cambridge, MA
Land Held for Development	$ 17,954
Depreciable Lives (Years)	N/A
Reston Gateway [Member]
Statement [Line Items]
Type	Land
Location	Reston, VA
Land Held for Development	$ 9,382
Depreciable Lives (Years)	N/A
Reston Eastgate [Member]
Statement [Line Items]
Type	Land
Location	Reston, VA
Land Held for Development	$ 9,077
Depreciable Lives (Years)	N/A
Crane Meadow [Member]
Statement [Line Items]
Type	Land
Location	Marlborough, MA
Land Held for Development	$ 8,721
Depreciable Lives (Years)	N/A
Broad Run Business Park [Member]
Statement [Line Items]
Type	Land
Location	Loudon County, VA
Land Held for Development	$ 6,042
Depreciable Lives (Years)	N/A
Cambridge Master Plan [Member]
Statement [Line Items]
Type	Land
Location	Cambridge, MA
Land Held for Development	$ 3,450
Depreciable Lives (Years)	N/A
Three Zero Shattuck Road [Member]
Statement [Line Items]
Type	Land
Location	Andover, MA
Land Held for Development	$ 1,145
Depreciable Lives (Years)	N/A

Real Estate and Accumulated Depreciation (Activity for Real Estate and Accumulated Depreciation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Notes to Financial Statements
Balance at the beginning of the year	$ 11,075,879	$ 10,602,278	$ 10,231,881
Assets sold/written-off	(4,913)	(7,636)	(250,236)
Balance at the end of the year	12,740,892	11,075,879	10,602,278
Assets sold/written-off	$ (3,952)	$ (4,938)	$ (22,984)