Amortization of interest rate contracts Other Comprehensive Income, Other, Net of Tax Stock Option Awards Conversion Ratio Stock Option Awards Conversion Ratio Stock Option Awards Conversion Ratio Lease Lease Operating Lease, Lease Income Adjustment to reflect redeemable partnership units at redemption value Partners' Capital Account, Redemptions Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at September 30, 2022 and December 31, 2021, respectively) Right-of-use assets - finance leases Finance Lease, Right-of-Use Asset, after Accumulated Amortization Real Estate Owned, Transfer from Real Estate Owned Real Estate Owned, Transfer from Real Estate Owned General Partner [Member] General Partner [Member] Preferred stock / units, shares / units outstanding (in shares / units) Series B, Shares Outstanding (in shares) Preferred Stock, Shares Outstanding Gains (losses) from investments in securities Gains (losses) from investments in securities Gain (Loss) on Investments Debt Instrument [Axis] Debt Instrument [Axis] Lease liabilities - finance leases (amounts related to VIEs of $20,568 and $20,458 at September 30, 2022 and December 31, 2021, respectively) Lease liabilities - finance leases Finance Lease, Liability Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,753,779 and $6,702,830 at September 30, 2022 and December 31, 2021, respectively) Real Estate Investment Property, at Cost Rental Expenses: Residential Rental Expenses Residential Rental Expenses Residential. Real Estate Real Estate Disclosure [Text Block] Limited Partners' Capital Account, Units Outstanding (in units) Limited Partners' Capital Account, Units Outstanding At Market Stock Offering Program Maximum Length Of Sale (in years) At Market Stock Offering Program Maximum Length Of Sale (in years) At Market Stock Offering Program Maximum Length Of Sale (in years) Recurring Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Other income (expense) Other Income and Expenses [Abstract] Additional paid-in capital Additional Paid in Capital Maximum Earned Awards Maximum Earned Awards Maximum Earned Awards Cash FDIC Insured Limit Cash FDIC Insured Limit Cash FDIC Insured Limit Portion At Fair Value Fair Value Disclosure [Domain] Fair Value Measurement [Domain] Debt Instrument, Basis Spread on Variable Rate Debt Instrument, Basis Spread on Variable Rate Options exercised Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Restriction on redemption of OP Unit to Common Stock (in years) Restriction On Redemption Restriction on redemption of OP unit to Common Stock Hotel [Member] Hotel [Member] Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Conversions of noncontrolling interests to stockholders’ equity Conversions of noncontrolling interests to Stockholders' Equity Conversions of noncontrolling interests to Stockholders' Equity 751 Gateway Holdings LLC 751 Gateway Holdings LLC [Member] 751 Gateway Holdings LLC BP/CRF Metropolitan Square LLC [Member] BP/CRF Metropolitan Square LLC [Member] BP/CRF Metropolitan Square LLC [Member] Restriction on redemption of OP units from date of issuance (years) Restriction On Redemption Of OP Units From Date Of Issuance In Years Restriction On Redemption Of OP Units From Date Of Issuance In Years General Partners' Capital Account, Units Outstanding (in units) General Partners' Capital Account, Units Outstanding Asset Acquisition [Table] Asset Acquisition [Table] PR II BXP Reston Gateway LLC PR II BXP Reston Gateway LLC [Member] PR II BXP Reston Gateway LLC Real Estate Properties [Domain] Real Estate Properties [Domain] Write-off (reinstatement) for accrued rent and accounts receivables Allowance for Loan and Lease Losses, Write-offs Measurement Input Type [Domain] Measurement Input Type [Domain] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Rental Revenue Total Rental Revenue Total Rental Revenue Total Entity Information [Line Items] Document Information [Line Items] Schedule Of Balance Sheets Of The Unconsolidated Joint Ventures [Text Block] Schedule Of Balance Sheets Of The Unconsolidated Joint Ventures [Text Block] Schedule Of Balance Sheets Of The Unconsolidated Joint Ventures [Text Block] Vested 2012 OPP units and MYLTIPS Conversion of 2012 OPP units and MYLTIPS [Member] Conversion of 2012 OPP units and MYLTIPS Amortization of interest rate contracts Amortization of Deferred Hedge Gains Equity Component [Domain] Equity Component [Domain] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Deductible in insurance as a percentage of the value of the affected property, San Francisco and Los Angeles Earthquake Deductible Insurance Percentage Of Value Of The Affected Property San Francisco and Los Angeles Earthquake Deductible Insurance Percentage Of Value Of The Affected Property San Francisco and Los Angeles Measurement Input, Discount Rate [Member] Measurement Input, Discount Rate [Member] Mortgage Notes [Member] Secured Debt [Member] Acquired Finite-Lived Intangible Assets [Line Items] Acquired Finite-Lived Intangible Assets [Line Items] Ownership [Axis] Ownership [Axis] 901 New York Avenue LLC [Member] Bp Crf Nine Zero One New York Avenue Llc [Member] BP/CRF Nine Zero One New York Avenue LLC [Member] Investment, Name [Domain] Investment, Name [Domain] Deferred financing costs Payments of Financing Costs Hotel Tower Developer LLC [Member] Hotel Tower Developer LLC [Member] Hotel Tower Developer LLC [Member] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] The Avant at Reston Town Center The Avant at Reston Town Center [Member] The Avant at Reston Town Center Supplemental disclosures: Supplemental Cash Flow Information [Abstract] Tenant improvements Payments for Tenant Improvements Debt Instrument, Description of Variable Rate Basis Debt Instrument, Description of Variable Rate Basis Stock Option And Incentive Plan And Stock Repurchase Plan [Domain] Stock Option And Incentive Plan And Stock Repurchase Plan [Domain] Stock Option And Incentive Plan And Stock Repurchase Plan [Domain] Unsecured line of credit Long-Term Line of Credit Entity Address, State or Province Entity Address, State or Province 125 Broadway One Two Five Broadway [Member] 125 Broadway Employee Stock Employee Stock [Member] Noncontrolling interest - Redeemable partnership units [Member] Noncontrolling interest - Redeemable partnership units [Member] Noncontrolling interest - Redeemable partnership units [Member] Transfer to Investments Transfer to Investments Other comprehensive income : Other Comprehensive Income (Loss), Net of Tax [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Cash and cash equivalents deconsolidated Payments for (Proceeds from) Other Real Estate Partnerships Award Type [Axis] Award Type [Axis] Debt Instrument, Interest Rate, Increase (Decrease) Debt Instrument, Interest Rate, Increase (Decrease) 11251 Roger Bacon Drive 11251 Roger Bacon Drive [Member] 11251 Roger Bacon Drive Area of Land Area of Land 195 West Street One Nine Five West Street [Member] One Nine Five West Street Excess stock, $0.01 par value, 150,000,000 shares authorized, none issued or outstanding Excess Stock Value Excess Stock Value Expenses Costs and Expenses [Abstract] Above Market Lease Intangibles [Member] Above Market Leases [Member] Noncontrolling interests in property partnerships Partners' Capital Attributable to Noncontrolling Interest Statements Of Operations Of The Joint Ventures Schedule Of Statements Of Operations Of The Unconsolidated Joint Ventures [Text Bock] Schedule Of Statements Of Operations Of The Unconsolidated Joint Ventures [Text Bock] Secured debt leverage ratio - maximum Secured debt leverage ratio - maximum Secured debt leverage ratio - maximum Noncash or Part Noncash Acquisition, Value of Assets Acquired Noncash or Part Noncash Acquisition, Value of Assets Acquired Total liabilities Liabilities Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Proceeds from note receivable Proceeds from Mortgage Deposits Document Type Document Type Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] MYLTIP 2019 [Member] MYLTIP two thousand nineteen [Member] MYLTIP two thousand nineteen [Member] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Redemption of operating partnership units to common stock, value Stock Issued During Period, Value, Conversion of Units Payments to Acquire Interest in Joint Venture Payments to Acquire Interest in Joint Venture Construction in progress Payments to Acquire Other Productive Assets Stockholders Equity / Partners Capital [Abstract] Stockholders Equity / Partners Capital [Abstract] Stockholders Equity / Partners Capital [Abstract] BP-M 3HB Venture LLC [Member] Three Hudson Boulevard [Member] 3 Hudson Boulevard [Member] Deferred Costs Gross Deferred Costs Gross Deferred Costs Gross Furniture, Fixtures and Equipment Furniture and Fixtures, Gross Seattle Seattle [Member] Seattle Asset Acquisition [Table Text Block] Asset Acquisition [Table Text Block] Debt Disclosure [Abstract] Debt Disclosure [Abstract] 325 Main Street Three Two Five Main Street [Member] Three Two Five Main Street [Member] 360 PAS Holdco LLC (indirect ownership) Three Six Zero PAS Holdco LLC (indirect ownership) [Member] Three Six Zero PAS Holdco LLC (indirect ownership) Unsecured Debt [Member] Unsecured Debt [Member] Interest and other income (loss) Interest and Other Income Interest and other income (loss) Interest and Other Income Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Future Office Building [Member] Future Office Building [Member] Future Office Building [Member] Accounting Policies [Abstract] Accounting Policies [Abstract] 2016 MYLTIP Units forfeited Stock Issued During Period, Shares, Share-based Compensation, Forfeited Shares Issued, Shares, Share-Based Payment Arrangement, Forfeited Debt Instrument, Unused Borrowing Capacity, Amount Debt Instrument, Unused Borrowing Capacity, Amount Line of Credit [Member] Line of Credit [Member] Exercise price $95.69 Exercise price $95.69 [Member] Exercise price $95.69 MYLTIP vesting 2021 MYLTIP vesting two thousand twenty one [Member] [Member] MYLTIP vesting 2021 [Member] [Member] Cumulative Effect, Period of Adoption [Domain] Cumulative Effect, Period of Adoption [Domain] 2012 Stock Option and Incentive Plan [Member] Two Thousand Twelve Stock Option and Incentive Plan [Member] Two Thousand Twelve Stock Option and Incentive Plan [Member] Stock Option and Incentive Plan Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] Future Retail Building [Member] Future Retail Building [Member] Future Retail Building [Member] Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] Weighted-average period (years) Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Lease liability - finance lease deconsolidated Lease liability - finance lease deconsolidation Lease liability - finance lease deconsolidation MYLTIP 2016 [Member] MYLTIP Two thousand sixteen [Member] MYLTIP 2016 [Member] Fair Value, by Balance Sheet Grouping [Table Text Block] Fair Value, by Balance Sheet Grouping [Table Text Block] Derivative Contract [Domain] Derivative Contract [Domain] Company's share of net operating income from joint ventures Net Operating Income Gross Profit Entity Registrant Name Entity Registrant Name Total adjustments Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities Weighted Average Price of Shares Purchased Share-Based Compensation Arrangement by Share-Based Payment Award, Per Share Weighted Average Price of Shares Purchased Building and improvements Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings Subsequent Events Subsequent Events [Text Block] Proceeds from sales of real estate Proceeds from Sale of Real Estate Held-for-investment Allocated net income for the period Equity Profit Loss Net Income. Accounts payable and accrued expenses (amounts related to VIEs of $35,043 and $29,464 at September 30, 2022 and December 31, 2021, respectively) Accounts payable and accrued expenses (amounts related to VIEs of $35,043 and $29,464 at September 30, 2022 and December 31, 2021, respectively) Accounts Payable and Accrued Liabilities Real Estate Properties [Line Items] Real Estate Properties [Line Items] Leases [Abstract] Leases [Abstract] Total equity / capital Equity, value Equity, value Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest LTIP and MYLTIP Units [Member] LTIP and 2014 MYLTIP Units [Member] LTIP and 2014 MYLTIP Units [Member]. Home Ownership Units [Member] home ownership units [Member] home ownership units [Member] Repayments of mezzanine notes payable Repayments of Subordinated Debt Minimum [Member] Minimum [Member] Entity Emerging Growth Company Entity Emerging Growth Company Common Stock, Par or Stated Value Per Share Common Stock, Par or Stated Value Per Share Proceeds from mortgage notes payable Proceeds from Issuance of Secured Debt Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Investment, Name [Axis] Investment, Name [Axis] Less: Accumulated amortization Accumulated Amortization Leasing And Financing Costs Accumulated Amortization Leasing And Financing Costs Trading Symbol Trading Symbol Entity File Number Entity File Number Deferred Charges Intangible Assets Disclosure [Text Block] Statement of Partners' Capital [Abstract] Statement of Partners' Capital [Abstract] 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Four Unsecured Term Loan Unsecured Term Loan [Member] Unsecured Term Loan Net income attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Redemption of unsecured senior notes Repayments of Unsecured Debt Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits, by Title of Individual [Axis] Title of Individual [Axis] Safeco Partner Entity Two Safeco Partner Entity Two [Member] Safeco Partner Entity Two Allocation of undistributed earnings to participating securities (in dollars per share / unit) Allocation of undistributed earnings to participating securities ($ per shares) Allocation of undistributed earnings to participating securities ($ per share shares) Derivative Instruments and Hedging Activities Derivatives, Policy [Policy Text Block] MYLTIP Value Amortized Into Earnings, Years MYLTIP Value Amortized Into Earnings, Years MYLTIP Value Amortized Into Earnings, Years Allocation of undistributed earnings to participating securities (in shares / units) Allocation of undistributed earnings to participating securities (in shares) Allocation of undistributed earnings to participating securities (in shares) Borrowings on unsecured line of credit Proceeds from Lines of Credit Use of Estimates in the Preparation of Financial Statements Use of Estimates, Policy [Policy Text Block] In-Place Lease Intangibles Leases, Acquired-in-Place [Member] 360 Park Avenue South Partners Entity Three Six Zero Park Avenue South Partners Entity One [Member] Three Six Zero Park Avenue South Partners Entity One Transfer Of Tenant Improvements Real Estate Transfer Of Tenant Improvements Real Estate Transfer Of Tenant Improvements Real Estate Total Capital [Member] Capital [Member] Capital [Member] Residential Tower Developer LLC [Member] Residential Tower Developer LLC [Member] Residential Tower Developer LLC [Member] Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Boston Properties Limited Partnership partners’ capital— 1,749,700 and 1,745,914 general partner units and 155,005,012 and 154,798,935 limited partner units outstanding at September 30, 2022 and December 31, 2021, respectively General And Limited Partners Capital Account General And Limited Partners Capital Account Acquisitions of real estate Payments to Acquire and Develop Real Estate Program trigger deductible Program trigger deductible Program trigger deductible Preferred Stock Redemption Charge Preferred Stock Redemption Premium Preferred Stock Redemption Premium Net income attributable to the company's common shareholders / unitholders (in dollars per share / unit) Earnings Per Share, Basic Forfeitures, in units Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Forfeitures Construction in progress Construction in Progress, Gross Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] Minimum square footage to make a potential additional payment to joint venture partner (in sqft) Minimum square footage to make a potential additional payment to joint venture partner (in sqft) Minimum square footage to make a potential additional payment to joint venture partner (in sqft) Distributions to noncontrolling interests in property partnerships Payments to Noncontrolling Interests Redemption/repurchase of unsecured exchangeable senior notes Repayments of Convertible Debt 360 Park Avenue South Partners Entity Two Three Six Zero Park Avenue South Partners Entity Two [Member] Three Six Zero Park Avenue South Partners Entity Two Gain Contingency, Nature [Domain] Gain Contingency, Nature [Domain] Ownership [Domain] Ownership [Domain] Entity Interactive Data Current Entity Interactive Data Current Noncontrolling Interest [Line Items] Noncontrolling Interest [Line Items] Cohen & Steers Realty Majors Portfolio Index [Member] Cohen & Steers Realty Majors Portfolio Index [Member] Cohen & Steers Realty Majors Portfolio Index [Member] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] ATM Program [Member] Atm Program [Member] Prior Atm Program [Member] Redemption of preferred stock Payments for Repurchase of Redeemable Preferred Stock Change in assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] MYLTIP 2021 Two Thousand Twenty-One MYLTIPS [Member] Two Thousand Twenty-One MYLTIPS Scenario, Plan Scenario, Plan [Member] Safeco Partner Entity One [Member] Safeco Partner Entity One [Member] Safeco Partner Entity One Receivable Type [Axis] Receivable Type [Axis] Net activity from stock option and incentive plan, value Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Class of Stock [Axis] Class of Stock [Axis] Income Taxes Income Tax, Policy [Policy Text Block] Long-Term Construction Loan Long-Term Construction Loan 7750 Wisconsin Avenue [Member] Seven Seven Five Zero Wisconsin Avenue [Member] 7750 Wisconsin Avenue [Member] Document Quarterly Report Document Quarterly Report Net Assets Acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Dividends in excess of earnings Retained Earnings (Accumulated Deficit) Weighted Average Number Of Shares Outstanding After Allocation of Undistributed Earnings to Participating Securities Basic (in shares) Weighted Average Number Of Shares Outstanding After Allocation of Undistributed Earnings to Participating Securities Basic (in shares) Weighted Average Number Of Shares Outstanding After Allocation of Undistributed Earnings to Participating Securities Basic (in shares) Scenario [Domain] Scenario [Domain] Stock Based Compensation Dilutive Securities, Effect on Basic Earnings Per Share Exercisable, Weighted Average Exercise Price Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Note receivable fixed interest rate Note receivable fixed interest rate Note receivable fixed interest rate Document Fiscal Year Focus Document Fiscal Year Focus Finite-lived Intangible Assets Amortization Expense Finite-Lived Intangible Assets Amortization Expense [Table Text Block] Loudoun County Land Loudoun County Land [Member] Loudoun County Land Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Payments on finance lease obligations Finance Lease, Principal Payments Building and other capital improvements Payments for Capital Improvements Deferred Charges Deferred Charges, Policy [Policy Text Block] Derivative, Cap Interest Rate Derivative, Cap Interest Rate Buildings and improvements Investment Building and Building Improvements Rental Expenses: % Of Grand Totals Percentage Of Total Rental Expenses Percentage Of Total Rental Expenses. 2012 OPP and 2013-2019 MYLTIP 2012 OPP and 2013-2019 MYLTIP [Member] 2012 OPP and 2013-2019 MYLTIP Extension Option (in years) Extension Option (in years) Extension Option (in years) Gateway Commons Complex prior to deferred contribution [Member] [Member] Gateway Commons Complex prior to deferred contribution [Member] [Member] Gateway Commons Complex prior to deferred contribution [Member] Net Operating Income: % of Grand Totals Percentage Of Total Net Operating Income Percentage Of Total Net Operating Income 6595 Springfield Center Drive [Member] Six Five Nine Five Springfield Center Drive [Member] Six Five Nine Five Springfield Center Drive Payments on capital lease obligations Repayments of Long-Term Capital Lease Obligations Equity Method Investment, Nonconsolidated Investee [Axis] Equity Method Investment, Nonconsolidated Investee [Axis] Separate Unrestricted Cash For Deferred Compensation Plan. Separate Unrestricted Cash For Deferred Compensation Plan. Separate Unrestricted Cash For Deferred Compensation Plan. Dividends Dividend Policy [Policy Text Block] Dividend Policy Basis differentials Equity Method Investment, Difference Between Carrying Amount and Underlying Equity Redeemable Common Units Redeemable Common Units Redeemable Common Units Noncontrolling interests in property partnerships Noncontrolling interest in property partnerships Noncontrolling Interest in Net Income (Loss) Limited Partnerships, Nonredeemable Common Stock, Shares, Outstanding Equity, shares Equity, shares Common Stock, Shares, Outstanding Investments in unconsolidated joint ventures Carying value of the Company's investment in unconsolidated joint ventures Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Washington, DC [Member] DISTRICT OF COLUMBIA Treasury common stock at cost, shares Treasury Stock, Shares Property, Plant and Equipment, Type [Axis] Long-Lived Tangible Asset [Axis] OPP Units 2012 [Member] Opp Units Two Thousand And Twelve [Member] Opp Units Two Thousand And Twelve [Member] Excess stock, par value Excess Stock Par Or Stated Value Per Share Excess Stock, Par or Stated Value Per Share Reallocation of noncontrolling interest Noncontrolling Interest, Increase from Subsidiary Equity Issuance 290 Binney Street 290 Binney Street [Member] 290 Binney Street Contractual Sales Price Contractual Sales Price Contractual Sales Price Entity Listing, Par Value Per Share Entity Listing, Par Value Per Share Geographical [Domain] Geographical [Domain] Entity Public Float Entity Public Float Metropolitan Square Metropolitan Square [Member] Metropolitan Square MYLTIP units issued (in shares) MYLTIP units issued MYLTIP units issued Operating expense Operating expense Operating expense Cost of Goods and Services Sold Earthquake Deductible Insurance Percentage of Value of the Affected Property Seattle Earthquake Deductible Insurance Percentage of Value of the Affected Property Seattle Earthquake Deductible Insurance Percentage of Value of the Affected Property Seattle Earned awards - Target Earned wards - Target Earned wards - Target Residential Building Apartment Building [Member] Issuance of operating partnership units for 360 Park Avenue South Other Significant Noncash Transaction, Value of Consideration Given Common stock, $0.01 par value, 250,000,000 shares authorized, 156,833,612 and 156,623,749 issued and 156,754,712 and 156,544,849 outstanding at September 30, 2022 and December 31, 2021, respectively Common Stock, Value, Issued Common Stock, Value, Issued Tenant Improvements Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Tenant Improvements Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Tenant Improvements Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Dividend Paid [Member] Dividend Paid [Member] Preferred Stock [Member] Preferred Units [Member] Preferred Stock [Member] Leases of Lessor Disclosure [Text Block] Leases of Lessor Disclosure [Text Block] 751 Gateway Seven Five One Gateway [Member] Seven Five One Gateway MYLTIP 2013 MYLTIP two thousand thirteen [Member] MYLTIP two thousand thirteen [Member] Other Income - assignment fee Other Income - assignment fee Other Income Cash and cash equivalents and cash held in escrows, beginning of period Cash and cash equivalents and cash held in escrows, end of period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Text Block [Abstract] Net income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest [Abstract] Number of floors Number of floors Number of floors Proceeds from unsecured senior notes Proceeds from Issuance of Unsecured Debt Debt Instrument, Measurement Input Debt Instrument, Measurement Input Board of Directors Chairman [Member] Board of Directors Chairman [Member] Accounting Standards Update 2016-02 Accounting Standards Update 2016-02 [Member] Company's share of equity Company Share Of Equity Company Share Of Equity Amendment Flag Amendment Flag Derivative, Basis Spread on Variable Rate Derivative, Basis Spread on Variable Rate Other comprehensive income Other Comprehensive Income (Loss), Net of Tax Minimum earned awards Minimum earned awards Minimum earned awards Number of VIEs Number of VIEs Number of VIEs - consolidated Below Market Lease Intangible [Member] Below Market Leases [Member] Below Market Leases Basis differential Income Statement Basis Differential Income Statement Basis Differential Construction in Progress Construction in Progress [Member] BNYA Amenity Operator LLC [Member] BNYA Amenity Operator LLC [Member] BNYA Amenity Operator LLC [Member] Goodwill and Intangible Assets Disclosure [Abstract] Preferred dividends / distributions Preferred Stock Dividends, Income Statement Impact Series B Dividend Rate Percentage Series B Dividend Rate Percentage Series B Dividend Rate Percentage Rental Revenue: Residential Rental Revenue Residential Rental Revenue Residential. Company's share of Net Operating Income Net Operating Income The net result for the period of deducting property operating expenses from property operating revenues. Number Exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number OP Units [Member] Op Units [Member] OP Units [Member] Depreciation and amortization Depreciation, Depletion and Amortization Land held for future development Land Available for Development Lease Intangibles Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Lease Obligation Incurred Lease Obligation Incurred 7750 Wisconsin Avenue LLC [Member] Seven seven five zero Wisconsin Avenue LLC [Member] 7750 Wisconsin Avenue LLC [Member] Operating Lease, Payments Operating Lease, Payments Redemption of OP units issued on conversion of LTIP, OPP and MYLTIP units (in shares) Redemption Of OP Units Issued On Conversion Of LTIP and MYLTIP Units Redemption Of OP Units Issued On Conversion Of LTIP and MYLTIP Units Distribution Declared to OP, LTIP, OPP and MYLTIP Units [Table Text Block] Dividends Declared [Table Text Block] Dividends Declared [Table Text Block] Treasury common stock at cost, 78,900 shares at September 30, 2022 and December 31, 2021 Treasury Stock, Value Expected price volatility Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Derivative, Forward Interest Rate Derivative, Forward Interest Rate Common stock, shares authorized Common Stock, Shares Authorized Excess stock, shares authorized Excess Stock, Shares Authorized Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Operating Operating Expenses Maximum [Member] Maximum [Member] 540 Madison Avenue [Member] Five Four Zero Madison Venture Llc [Member] Five Four Zero Madison Venture LLC [Member]. New York [Member] NEW YORK Cash and cash equivalents (amounts related to VIEs of $249,124 and $300,937 at September 30, 2022 and December 31, 2021, respectively) Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Cash and Cash Equivalents, at Carrying Value Dividends Payable [Line Items] Dividends / Distributions [Line Items] Dividends Payable [Line Items] Coverage For Acts Of Terrorism Under TRIA Covered in Excess of Amount Covered by IXP Coverage For Acts Of Terrorism Under TRIA Covered in Excess of Amount Covered by IXP Coverage For Acts Of Terrorism Under TRIA Covered in Excess of Amount Covered by IXP Conversion of redeemable partnership units, value Partners' Capital Account, Exchanges and Conversions Stockholders' Equity / Partners' Capital Stockholders' Equity Note Disclosure [Text Block] Noncontrolling interests: Noncontrolling Interest Items [Abstract] LTIP units issued (in shares) LTIP units issued LTIP units issued Unsecured senior notes, net Senior Notes 140 Kendrick Street One Four Zero Kendrick Street [Member] One Four Zero Kendrick Street MYLTIP vesting 2020 [Member] MYLTIP vesting two thousand twenty [Member] MYLTIP vesting 2020 [Member] Los Angeles [Member] Los Angeles [Member] Los Angeles [Member] Consolidation, Variable Interest Entity, Policy Consolidation, Variable Interest Entity, Policy [Policy Text Block] Properties Name of Joint Venture Property Name of Joint Venture Property Tenant and other receivables, net Increase (Decrease) in Accounts Receivable Title of 12(b) Security Title of 12(b) Security Operating partnership guarantee to cover liabilities of IXP Operating partnership guarantee to cover liabilities of subsidiary Operating partnership guarantee to cover liabilities of subsidiary Organization Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Accrued rental income, net (amounts related to VIEs of $359,439 and $357,395 at September 30, 2022 and December 31, 2021, respectively) Accrued rental income, net (amounts related to VIEs of $359,439 and $357,395 at September 30, 2022 and December 31, 2021, respectively) Deferred Rent Receivables, Net Subsequent Event [Line Items] Subsequent Event [Line Items] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Repayments of unsecured line of credit Repayments of Lines of Credit Unsecured term loan Unsecured term loan, net Other Borrowings Segment Reporting Disclosure [Text Block] Segment Reporting Disclosure [Text Block] Equity Method Investment, Nonconsolidated Investee [Domain] Equity Method Investment, Nonconsolidated Investee [Domain] Rental Expenses: Class A Office Rental Expenses Class Office Rental Expenses Class Office Square 407 Limited Partnership [Member] Square Four Zero Seven Limited Partnership [Member] Square 407 Limited Partnership [Member]. LIABILITIES AND EQUITY LIABILITIES AND MEMBERS'/PARTNERS' EQUITY Liabilities and Equity [Abstract] Estimated Fair Value [Member] Estimate of Fair Value Measurement [Member] Number of VIEs - Total Number of VIEs - Total Number of VIEs - Total Real Estate Real Estate, Policy [Policy Text Block] Noncash or Part Noncash Acquisition, Other Assets Acquired Noncash or Part Noncash Acquisition, Other Assets Acquired MYLTIP 2018 MYLTIP Two thousand eighteen [Member] MYLTIP Two thousand eighteen Performance Index [Axis] Performance Index [Axis] Performance Index [Axis] Gains on sales of real estate Gains on sales of real estate Gains on sales of real estate Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Weighted average number of common shares / units outstanding (in shares / units) Net income attributable to the company's common shareholders / unitholders (in shares / units) Weighted Average Number of Shares Outstanding, Basic One OP unit is equivalent to one share of Common Stock (in shares) Common Stock Conversion Rate Common Stock Conversion Rate Reston Next Residential Reston Next Residential [Member] Reston Next Residential Ownership Percentage Equity Method Investment, Ownership Percentage Construction in progress, net deconsolidated Construction in progress, net deconsolidated Construction in progress, net deconsolidated MYLTIP vesting 2022 MYLTIP vesting two thousand twenty two [Member] MYLTIP vesting 2022 [Member] Distributions percent before measurement date Distributions Percent Before Measurement Date Distributions Percent Before Measurement Date Safeco Plaza Safeco Plaza [Member] Safeco Plaza Tenant and other receivables, net (amounts related to VIEs of $11,842 and $6,824 at September 30, 2022 and December 31, 2021, respectively) Tenant and other receivables, net (amounts related to VIEs of $11,842 and $6,824 at September 30, 2022 and December 31, 2021, respectively) Accounts Receivable, after Allowance for Credit Loss Derivative, Notional Amount Derivative, Notional Amount Preferred stock, $0.01 par value, 50,000,000 shares authorized, none issued or outstanding Preferred Stock, Value, Issued Accrued interest payable Increase (Decrease) in Interest Payable, Net Redeemable deferred stock units— 93,175 and 83,073 units outstanding at redemption value at September 30, 2022 and December 31, 2021, respectively Redeemable Noncontrolling Interest, Equity, Carrying Amount Restricted Stock [Member] Restricted Stock [Member] Deferred Costs, total Deferred Costs Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Repayments of unsecured term loan Repayments of Other Debt Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Lessee, Leases Lessee, Leases [Policy Text Block] Preferred Stock, Redemption Price Per Share Preferred Stock, Redemption Price Per Share Noncontrolling Interests [Member] Noncontrolling Interest [Member] Noncontrolling Interest [Member] stock option stock option exercised [Member] Stock Option Exercised Company's Share of Net Operating Income: % of Grand Totals Percentage of Company's Share of Net Operating Income Percentage of Company's Share of Net Operating Income Stock Based Compensation (in shares / units) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Number of extensions Number of extensions Number of extensions Diluted earnings per common share / unit attributable to the Company Diluted Earnings: Earnings Per Share, Diluted [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Above and below market rent adjustments, net Above And Below Market Rent Adjustments Above And Below Market Rent Adjustments Future Residential Building [Member] Future Residential Building [Member] Future Residential Building [Member] Madison Centre Madison Centre [Member] Madison Centre Current Fiscal Year End Date Current Fiscal Year End Date Op units and LTIP units Op units and LTIP units [Member] Op units and LTIP units Lessee Disclosure [Abstract] Lessee Disclosure [Abstract] Fixed charge coverage - minimum Fixed charge coverage - minimum Fixed charge coverage - minimum Company's Share [Member] Company's Share [Member] Company's Share [Member] Commitments And Contingencies Disclosure [Table] Commitments And Contingencies Disclosure [Table] Commitments and Contingencies Disclosure [Table] Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Shares Issued Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Shares Issued Allocation of undistributed earnings to participating securities Participating Securities, Distributed and Undistributed Earnings (Loss), Basic Employee and director payment per share (in dollars per share) Employee and director payment per share Employee and director payment per share Transfer Of Tenant Lease Costs Real Estate Transfer Of Tenant Lease Costs Real Estate Transfer Of Tenant Lease Costs Real Estate Allowance for current expected credit losses Provision for Loan and Lease Losses Return of deposit on mortgage note payable interest rate lock Proceeds from (Payments for) Other Financing Activities Reston Next Office Phase II Reston Next Office Phase II [Member] Reston Next Office Phase II Leverage ratio - maximum Leverage ratio - maximum Leverage ratio - maximum Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Straight Line Rent Adjustments Straight Line Rent Adjustments Final awards percentage of target Final awards percentage of target Final awards percentage of target Right of use assets - finance leases Right of use assets - finance leases Right of use assets - finance leases 300 Binney Street Three Zero Zero Binney Street [Member] Three Zero Zero Binney Street Adjustable Rate Loans Adjustable Rate Loans [Member] Reconciliation of cash and cash equivalents and cash held in escrow Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents [Abstract] Equity [Abstract] Equity [Abstract] Gateway Portfolio Holdings LLC [Member] Gateway Commons Complex [Member] Gateway Commons Complex [Member] Gateway Commons Complex [Member] Subsequent Event [Table] Subsequent Event [Table] Entity Tax Identification Number Entity Tax Identification Number Common stock available for issuance Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Noncontrolling Interest, Outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number Earnings Per Share After Allocation of Undistributed Earnings to Participating Securities Basic (dollars per share) Earnings Per Share After Allocation of Undistributed Earnings to Participating Securities Basic (dollars per share) Earnings Per Share After Allocation of Undistributed Earnings to Participating Securities Basic (dollars per share) Earnings Per Share After Allocation of Undistributed Earnings to Participating Securities Basic (dollars per share) Prepaid rent reclassified to right of use asset Prepaid rent reclassified to right of use asset Prepaid rent reclassified to right of use asset Consolidated Entities [Domain] Consolidated Entities [Domain] Maximum funding obligation Guarantor Obligations, Maximum Exposure, Undiscounted Net increase (decrease) in cash and cash equivalents and cash held in escrows Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Entity Central Index Key Entity Central Index Key Real Estate [Abstract] Real Estate [Abstract] Repayments of mortgage notes payable Repayments of Secured Debt Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Vesting Period [Axis] Vesting Period [Axis] Vesting Period [Axis] Measurement Input Type [Axis] Measurement Input Type [Axis] Stock Option and Incentive Plan Term Period Stock Option and Incentive Plan Term Period Stock Option and Incentive Plan Term Period Entity [Domain] Entity [Domain] City Area Code City Area Code ASSETS Assets [Abstract] OP unit conversion rate (in shares) OP Unit Conversion Rate OP Unit Conversion Rate. 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Building A One Four Zero Kendrick - Building A [Member] One Four Zero Kendrick - Building A Proceeds from assignment fee Other income - assignment fee Proceeds from Sale of Intangible Assets Proceeds from noncontrolling interest including a contribution related to the repayment of a members' note payable Proceeds from noncontrolling interest including a contribution related to the repayment of a members' note payable Proceeds from noncontrolling interestt including a contribution reltaed to the repayment of a members' note payable Value of MYLTIP Awards Value of MYLTIP Awards Value of MYLTIP Awards Proceeds from Interest Received Proceeds from Interest Received Net activity from equity transactions Proceeds from Issuance or Sale of Equity Unconsolidated Joint Ventures [Member] Unconsolidated Joint Ventures [Member] Unconsolidated Joint Ventures [Member] Annual Aggregate Limit of Earthquake Insurance Seattle Annual Aggregate Limit of Earthquake Insurance Seattle Annual Aggregate Limit of Earthquake Insurance Seattle Deposit on capital lease Payments for (Proceeds from) Other Investing Activities Range [Domain] Statistical Measurement [Domain] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Share-Based Payment Arrangement [Abstract] Acquisition of noncontrolling interest in property partnership Proceeds from (Payments to) Noncontrolling Interests Boston Properties Limited Partnership Partners' Capital (General and Limited Partners)[Member] Boston Properties Limited Partnership [Member] Boston Properties Limited Partnership MYLTIP Units distribution as percentage of OP Unit distribution prior to measurement date Outperformance Awards Long Term Incentive Plan Units Distribution As Percentage Of Op Unit Distribution Prior To Measurement Date Prior to the measurement date on February 5, 2011, 2008 OPP Units will be entitled to receive per unit distributions equal to one-tenth (10%) of the regular quarterly distributions payable on an OP Unit, but will not be entitled to receive any special distributions. TSR measurement (in years) TSR Measurement, Years TSR Measurement, Years. MYLTIP 2018 two thousand eighteen MYLTIP [Member] 2018 MYLTIP [Member] Accounting Standards Update 2018-09 Accounting Standards Update 2018-09 [Member] Dividends and distributions payable Dividends and distributions declared but not paid Dividends Payable Net income attributable to the Company Net Income (Loss) Attributable to Parent Cumulative Effect, Period of Adoption [Axis] Cumulative Effect, Period of Adoption [Axis] Distributions Partners' Capital Account, Distributions Mortgage notes payable, net (amounts related to VIEs of $3,271,157 and $3,267,914 at September 30, 2022 and December 31, 2021, respectively) Mortgage notes payable, net Mortgage and notes payable, net Secured Debt Subsequent Event Type [Axis] Subsequent Event Type [Axis] Fed Funds Effective Rate Overnight Index Swap Rate Fed Funds Effective Rate Overnight Index Swap Rate [Member] Colorado Center [Member] Colorado Center [Member] Colorado Center [Member] Consolidation, Less than Wholly Owned Subsidiary, Parent 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[Abstract] Statement of Cash Flows [Abstract] Debt Instrument, Interest Rate Terms Debt Instrument, Interest Rate Terms Hub50House [Member] Hub50House [Member] Hub50House Gains (Losses) on Sales of Investment Real Estate Gains (Losses) on Sales of Investment Real Estate Basis Of Presentation And Summary Of Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Performance Index [Domain] Performance Index [Domain] Performance Index [Domain] Preferred Stock Redemption Price Per Share, plus accrued and unpaid dividends Preferred Stock Redemption Price Per Share, plus accrued and unpaid dividends Preferred Stock Redemption Price Per Share, plus accrued and unpaid dividends Other liabilities (amounts related to VIEs of $104,663 and $150,131 at September 30, 2022 and December 31, 2021, respectively) Other Liabilities Other Liabilities Other Liabilities Sale of an interest in property partnerships sale of an interest in property partnerships sale of an interest in property partnerships San Francisco [Member] San Francisco [Member] San Francisco [Member] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Document Annual Report Document Annual Report Legal Entity [Axis] Legal Entity [Axis] Boston Properties Limited Partnership Subsidiaries [Member] Total partners’ capital Partners' Capital Geographical [Axis] Geographical [Axis] Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights Property, Plant and Equipment Property, Plant and Equipment [Table Text Block] Preferred stock / units, shares / units issued (in shares / units) Preferred Stock, Shares Issued Value of program trigger Program Trigger Value Program Trigger Value Dock 72 [Member] Dock Seven Two [Member] Dock Seven Two Safeco Plaza REIT LLC Safeco Plaza REIT LLC [Member] Safeco Plaza REIT LLC Capital distributions from unconsolidated joint ventures Proceeds from Equity Method Investment, Distribution, Return of Capital Unsecured Term Loan Debt Disclosure [Text Block] Real estate and development in process, net Total real estate Real Estate Investment Property, Net Boston [Member] Boston [Member] Boston [Member] Product and Service [Domain] Product and Service [Domain] Entity Shell Company Entity Shell Company 360 Park South Avenue 360 Park South Avenue [Member] 360 Park South Avenue Number of Units in Real Estate Property Number of Units in Real Estate Property Company's share of net income Companys share of net income (loss) Company's share of net income (loss) MYLTIP 2015 [Member] MYLTIP two thousand fifteen [Member] MYLTIP 2015 [Member] Preferred Stock, Redeemed Proceeds from (Repurchase of) Redeemable Preferred Stock Subsequent Event [Member] Subsequent Event [Member] Consolidation Items [Domain] Consolidation Items [Domain] Document Period End Date Document Period End Date Rental Expenses: Total Rental Expenses Operating Expenses Total Rental Expenses Operating Expenses Total. 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Boston Properties, Inc. [Member] Parent Company [Member] Number of buildings number of buildings number of buildings Subsequent Events [Abstract] Subsequent Events [Abstract] Total revenue Total revenue Revenues Number of Additional Shares Authorized Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized Effective portion of interest rate contracts Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Debt prepayment and extinguishment costs Payment for Debt Extinguishment or Debt Prepayment Cost Payment for Debt Extinguishment or Debt Prepayment Cost Treasury Stock, at cost [Member] Treasury Stock [Member] Total stockholders' equity attributable to Boston Properties, Inc. Members’/Partners’ equity Stockholders' Equity Attributable to Parent Vesting [Domain] Vesting [Domain] Leased percentage Leased percentage Leased percentage 360 PAS Holdco LLC Three Six Zero PAS Holdco LLC [Member] Three Six Zero PAS Holdco LLC Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] 2025 Finite-Lived Intangible Asset, Expected Amortization, Year Three Dividends and distributions Payments of Dividends Dividends In Excess Of Earnings [Member] Dividends In Excess Of Earnings [Member] Retained Earnings [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] At The Market Stock Offering Program Aggregate Value Of Common Stock At The Market Stock Offering Program Aggregate Value Of Common Stock At The Market Stock Offering Program, Aggregate Value Of Common Stock Dividends, Common Stock, Cash Dividends, Common Stock, Cash Tenant leasing costs Lease, Cost Common Stock [Member] Common Stock [Member] Lease, Cost Lease, Cost [Table Text Block] Revenue Recognition Revenue [Policy Text Block] Statement [Table] Statement [Table] Gain on sale of investment in unconsolidated joint venture Equity Method Investment, Realized Gain (Loss) on Disposal Other Than Stock Options Awards Conversion Ratio Other Than Stock Options Awards Conversion Ratio Other Than Stock Options Awards Conversion Ratio Leasing costs, including lease related intangibles Deferred Costs, Leasing, Gross Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Range [Axis] Statistical Measurement [Axis] Increase (Decrease) in Operating Liabilities Increase (Decrease) in Operating Liabilities Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] MYLTIP 2022 MYLTIP Two Thousand Twenty Two [Member] MYLTIP Two Thousand Twenty Two Investments in securities, net Payments to Acquire Marketable Securities Equity Components [Axis] Equity Components [Axis] Contributions from noncontrolling interests in property partnerships Proceeds from Noncontrolling Interests Dividends Payable [Table] Dividends Payable [Table] MYLTIP Units forfeited MYLTIPUnitsForfeited MYLTIP Units Forfeited Lehman [Member] Lehman [Member] Lehman [Member] Per occurrence limit for NBCR Coverage Per occurrence limit for NBCR Coverage Per occurrence limit for NBCR Coverage Noncontrolling interest - redeemable preferred units Noncontrolling Interest in Net Income (Loss) Preferred Unit Holders, Redeemable Statement [Line Items] Statement [Line Items] 2021 Stock Incentive Plan 2021 Stock Incentive Plan [Member] 2021 Stock Incentive Plan Partners' Capital (General and Limited Partners) [Member] Boston Properties Limited Parntership [Member] Boston Properties Limited Parntership [Member] Rosecrans-Sepulveda Partners 4, LLC Rosecrans-Sepulveda Partners Four, LLC [Member] Rosecrans-Sepulveda Partners Four, LLC MYLTIP 2014 MYLTIP Two thousand fourteen [Member] MYLTIP Two thousand fourteen [Member] Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award Share-Based Compensation Arrangement by Share-Based Payment Award, Terms of Award Variable Rate [Domain] Variable Rate [Domain] Operating Lease, Lease Income [Table Text Block] Operating Lease, Lease Income [Table Text Block] Right of use assets - operating leases Operating Lease, Right-of-Use Asset Accumulated Other Comprehensive Loss [Member] AOCI Attributable to Parent [Member] Non-Qualified Employee Stock Purchase Plan [Member] Non-Qualified Employee Stock Purchase Plan [Member] Non-Qualified Employee Stock Purchase Plan [Member] Unvested MYLTIP Units [Member] Unvested MYLTIP Units [Member] Unvested 2018-2020 MYLTIPS[Member] Document Transition Report Document Transition Report Local Phone Number Local Phone Number Financing costs Deferred Offering Costs Share-based Payment Arrangement, Option, Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Redemption of OP Unit equivalent to Common Stock (in shares) OP Unit Equivalence To Common Stock One OP Unit is equivalent to one common stock (share). Transaction costs Transaction costs Other Cost and Expense, Operating Cash released from escrow for investing activities Increase (Decrease) in Restricted Cash (Deprecated 2022) Effect of Dilutive Securities: Weighted Average Number of Shares Outstanding, Diluted, Adjustment [Abstract] Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Schedule of Real Estate Properties [Table] Schedule of Real Estate Properties [Table] Net Income Available To Common Stockholders After Allocation of Undistributed Earnings to Participating Securities Basic Net Income Loss Available To Common Stockholders After Allocation of Undistributed Earnings to Participating Securities Basic Net Income Loss Available To Common Stockholders After Allocation of Undistributed Earnings to Participating Securities Basic Fixed contractual payments Operating Lease, Lease Income, Lease Payments Name of Property [Domain] Name of Property [Domain] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Preferred stock, par value Preferred Stock, Par or Stated Value Per Share Income Statement [Abstract] Income Statement [Abstract] Additional Paid-In Capital [Member] Additional Paid-in Capital [Member] Document Fiscal Period Focus Document Fiscal Period Focus Basic earnings per common share / unit attributable to the Company Basic Earnings: Earnings Per Share, Basic [Abstract] Proceeds from sale of investment in unconsolidated joint venture Proceeds from Sale of Equity Method Investments Weighted average number of common and common equivalent shares / units outstanding (in shares / units) Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders (in shares / units) Weighted Average Number of Shares Outstanding, Diluted Expected life assumed to calculate per unit fair value per LTIP unit (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table] Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table] Real Estate Properties [Axis] Real Estate Property Ownership [Axis] NonControlling Interest Redeemable Partnership Units Common Units Shares Outstanding NonControlling Interest Redeemable Partnership Units Common Units Shares Outstanding NonControlling Interest Redeemable Partnership Units Common Units Shares Outstanding Dividends, Per Unit, Cash Paid Common Stock / Unit, Dividends / Distributions, Per Share / Unit, Cash Paid Common Stock, Dividends, Per Share, Cash Paid ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Base Rate [Member] Base Rate [Member] Investments in securities Marketable Securities Exercise Price $98.46 Exercise Price $98.46 [Member] Exercise Price $98.46 Debt Instrument, Covenant Compliance Debt Instrument, Covenant Compliance Origination of Notes Receivable from Related Parties Origination of Notes Receivable from Related Parties Carrying Amount [Member] Reported Value Measurement [Member] Outside members’ notes payable contributed to noncontrolling interests in property partnerships Debt Conversion, Original Debt, Amount Equity Offering Costs Equity Offering Costs Policy [Policy Text Block] Equity Offering Costs Policy 767 Venture, LLC [Member] Seven Six Seven Venture Llc [Member] Seven Six Seven Venture LLC [Member] Unvested 2017 - 2019 MYLTIP Units [Member] Unvested Two Thousand Seventeen, Eighteen and Nineteen MYLTIP Units [Member] Unvested Two Thousand Seventeen, Eighteen and Nineteen MYLTIP Units [Member] BNY Tower Holdings LLC [Member] Dock 72 BNY Tower Holdings LLC [Member] BNY Tower Holdings LLC [Member] Preferred Stock, Redemption Date Preferred Stock, Redemption Date Limited Partner [Member] Limited Partner [Member] Preferred stock, shares authorized Preferred Stock, Shares Authorized CA-Colorado Center LLC[Member] Colorado Center CA-Colorado Center LLC [Member] CA-Colorado Center LLC [Member] Commitments And Contingencies Commitments and Contingencies Disclosure [Text Block] Net income attributable to the Company's common shareholders / unitholders Net income attributable to the company's common shareholders / unitholders Net Income (Loss) Available to Common Stockholders, Basic Investments In Unconsolidated Joint Ventures Equity Method Investments [Table Text Block] Common stock, shares issued Shares issued Common Stock, Shares, Issued Stockholders Equity / Partner Capital [Abstract] Stockholders Equity / Partner Capital [Abstract] Stockholders Equity / Partner Capital [Abstract] Change in real estate included in accounts payable and accrued expenses Capital Expenditures Incurred but Not yet Paid Joint Venture Partner [Member] Joint Venture Partner [Member] Joint Venture Partner [Member] Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Value Of LTIP Units Issued Value Of LTIP Units Issued Value Of LTIP Units Issued. Investment in Securities Investment, Policy [Policy Text Block] Shares issued pursuant to stock purchase plan, value Stock Issued During Period, Value, Employee Stock Purchase Plan Comprehensive income attributable to the Company Comprehensive Income (Loss), Net of Tax, Attributable to Parent Weighted Average Exercise Price Exercised Weighted Averge Exercise Price Exercised Weighted Averge Exercise Price MYLTIP MYLTIP [Member] MYLTIP Construction Loan Construction Loan Schedule Of Segment Information By Geographic Area And Property Type Schedule of Segment Reporting Information, by Segment [Table Text Block] Entity Current Reporting Status Entity Current Reporting Status Impairment of Real Estate Impairment loss Impairment of Real Estate Other Liabilities, Current Other Liabilities, Current Unsecured debt leverage ratio - maximum Unsecured debt leverage ratio - maximum Unsecured debt leverage ratio - maximum LTIP Units [Member] LTIP Units [Member] LTIP Units [Member]. Investments In Affiliates Subsidiaries Associates And Joint Ventures net Investments In Affiliates Subsidiaries Associates And Joint Ventures net Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. Accrued rental income, net deconsolidated Accrued rental income, net deconsolidated Accrued rental income, net deconsolidated Rental Direct Costs of Leased and Rented Property or Equipment Repayments of outside members’ notes payable Repayments of Notes Payable Distributions Payable, Amount Per Unit Dividends Payable, Amount Per Share / Unit Dividends Payable, Amount Per Share Noncontrolling interest - common units of the Operating Partnership Noncontrolling interest-common units of the Operating Partnership Noncontrolling Interest in Net Income (Loss) Operating Partnerships, Redeemable Excess stock, shares outstanding Excess Stock, Shares Outstanding Shares issued pursuant to stock purchase plan, shares Stock Issued During Period, Shares, Employee Stock Purchase Plans Beginning outstanding, shares Ending outstanding, shares Beginning outstanding, shares Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Per occurrence limit of the earthquake insurance which covers San Francisco and Los Angeles regions Per Occurrence Limit Of Earth Quake Insurance San Francisco and Los Angeles Per Occurrence Limit Of Earth Quake Insurance San Francisco and Los Angeles Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Liabilities: Liabilities [Abstract] Entities [Table] Entities [Table] Schedule of Finite-Lived Intangible Assets Acquired Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Unvested Restricted stock and LTIP Units [Member] Unvested Restricted stock and LTIP Units [Member] Unvested Restricted stock and LTIP Units [Member] Leverage ratio Leverage ratio Leverage ratio Title of Individual with Relationship to Entity [Domain] Title of Individual [Domain] Schedule of Real Estate Properties Property, Plant, and Equipment, Lessor Asset under Operating Lease [Table Text Block] Dividends declared Dividends Net Rentable Area (in sf) Net Rentable Area Issuance of restricted securities to employees and non-employee directors Issuance of restricted securities to employees and directors Issuance of restricted securities to employees and directors Common Stock Weighted Average Price (in dollars per share) Common Stock Weighted Average Price Common Stock Weighted Average Price. Total Long-Term Debt one tower center one tower center [Member] one tower center Weighted Average Number Diluted Shares Outstanding Adjustment (per share) Weighted Average Number Diluted Shares Outstanding Adjustment (per share) Weighted Average Number Diluted Shares Outstanding Adjustment (per share) SMBP Venture LP [Member] Santa Monica Business Park [Member] Santa Monica Business Park [Member] Noncontrolling interest: Temporary Equity [Abstract] NonControlling Interest Redeemable Partnership Units Common Units Long Term Incentive Units At Redemption Value Shares Outstanding NonControlling Interest Redeemable Partnership Units Common Units Long Term Incentive Units At Redemption Value Shares Outstanding NonControlling Interest Redeemable Partnership Units Common Units Long Term Incentive Units At Redemption Value Shares Outstanding Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax 880 Winter Street [Member] Eight Eight Zero Winter Street [Member] Eight Eight Zero Winter Street Exercised Stock Issued During Period Shares Stock Options Exercise Stock Issued During Period Shares Stock Options Exercise Cash Held in Escrows Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Debt Instrument, Maturity Date Debt Instrument, Maturity Date Construction Construction [Member] Cash held in escrows Increase (Decrease) in Restricted Cash for Operating Activities (Deprecated 2022) Entity Small Business Entity Small Business Margin based on borrower's credit rating Margin based on borrower's credit rating [Member] Margin based on borrower's credit rating Variable lease payments Operating Lease, Variable Lease Income Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts [Axis] Measurement Basis [Axis] Amortization of right of use assets - operating leases Operating Lease, Right-of-Use Asset, Amortization Expense Number of shares issued Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period Revenue Revenues [Abstract] Summary Of Significant Accounting Policies [Table] Summary Of Significant Accounting Policies [Table] Summary Of Significant Accounting Policies [Table] Property partnerships Noncontrolling Interest in Limited Partnerships Noncontrolling Interest in Limited Partnerships Unrecognized compensation expenses Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Non-cash portion of interest expense Paid-in-Kind Interest Property, Plant and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] Number of real estate properties Number of Real Estate Properties Consolidated Entities [Axis] Consolidated Entities [Axis] Gain on Sale of Investments Gain on Sale of Investments Distributions of net cash flow from operations of unconsolidated joint ventures Proceeds from Equity Method Investment, Distribution Total expenses Total expenses Costs and Expenses Shares of Common Stock issued in connection with redemption of an equal number of OP Units (in shares) Conversion of Stock, Shares Issued Asset Acquisition, Price of Acquisition, Expected Asset Acquisition, Price of Acquisition, Expected Prepaid expenses and other assets, net deconsolidated Prepaid expenses and other assets, net deconsolidated Prepaid expenses and other assets, net deconsolidated Debt Instrument [Line Items] Debt Instrument [Line Items] Accrued interest payable Interest Payable Class of Stock [Line Items] Class of Stock [Line Items] Net activity from stock option and incentive plan, shares Net activity from contributions and unearned compensation Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Lease liabilities - operating leases Operating Lease, Liability Land Land Stock-Based Employee Compensation Plans Share-Based Payment Arrangement [Policy Text Block] Finance Lease, Liability, Maturity Finance Lease, Liability, Fiscal Year Maturity [Table Text Block] 2024 Finite-Lived Intangible Asset, Expected Amortization, Year Two 760 Boylston Street [Member] 760 Boylston Street [Member] 760 Boylston Street Noncontrolling Interest [Table] Noncontrolling Interest [Table] 601 Lexington Avenue Six Zero One Lexington Avenue [Member] Six Zero One Lexington Avenue [Member] Office Tower Developer LLC [Member] One Hundred Causeway Street [Member] 100 Causeway Street [Member] Impairment loss on investment Other than Temporary Impairment Losses, Investments Borrowings on unsecured term loan Proceeds from Other Debt Write-off of fully depreciated real estate Write off of fully depreciated real estate Write off of fully depreciated real estate Net activity from contributions and unearned compensation, value Partners' Capital Account, Contributions Entity Filer Category Entity Filer Category Equity / Capital: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Related Party Note Receivable [Member] Financing Receivable [Member] Common units of the Operating Partnership Noncontrolling Interest in Operating Partnerships Stock based compensation expense Share-Based Payment Arrangement, Expense Commitments and contingencies (See Note 7) Commitments and Contingencies Security Exchange Name Security Exchange Name Beginning outstanding, Weighted-average Exercise Price Ending outstanding, Weighted-average Exercise Price Weighted Average Exercise Price Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Unsecured debt leverage ratio Unsecured debt leverage ratio Unsecured debt leverage ratio Total Real Estate Investment Property At Cost Including Right of Use Assets Real Estate Investment Property At Cost Including Right of Use Assets Rental Revenue: Class A Office Rental Revenue Class A Office Rental Revenue Class A Office Segment Reconciling Items Segment Reconciling Items [Member] Unconsolidated Properties Unconsolidated Properties [Member] 1265 Main Office JV LLC [Member] One Two Six Five Main Office JV LLC [Member] 1265 Main Office JV LLC [Member] Rental Revenue: % of Grand Totals Percentage Of Total Revenue These are percentages not monetary value 651 Gateway Six Five One Gateway [Member] 651 Gateway Prepaid expenses and other assets (amounts related to VIEs of $44,525 and $29,668 at September 30, 2022 and December 31, 2021, respectively) Prepaid Expense and Other Assets Dividends [Domain] Dividends [Domain] Cover [Abstract] Cover [Abstract] Interest capitalized Interest Costs Capitalized Entity Voluntary Filers Entity Voluntary Filers Depreciation and amortization Depreciation and amortization expense Depreciation, Depletion and Amortization, Nonproduction Less: accumulated depreciation (amounts related to VIEs of $(1,352,781) and $(1,283,060) at September 30, 2022 and December 31, 2021, respectively) Less: accumulated depreciation Real Estate Investment Property, Accumulated Depreciation Other assets Other Assets Property insurance program per occurrence limits Insurance Policy Limit Insurance Policy Limit Segment Reporting [Abstract] Segment Reporting [Abstract] WP Project Developer LLC [Member] Wp Project Developer Llc [Member] WP Project Developer LLC [Member] Issuance of notes receivable, net Payments to Acquire Loans Receivable Risk-free rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Total liabilities and equity / capital Liabilities and Equity Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] General and limited partnership interest in the operating partnership (percent) Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest Schedule Of Reconciliation Of Net Operating Income To Net Income Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Noncontrolling interest - property partnerships [Member] Noncontrolling interest - property partnerships [Member] Noncontrolling interest - property partnerships [Member] Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders Net Income (Loss) Available to Common Stockholders, Diluted Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit) Earnings Per Share, Diluted Increase (decrease) in parking and other revenue primarily related to COVID-19 Increase (decrease) in parking and other revenue primarily related to COVID-19 compared to 2019 Increase (decrease) in parking and other revenue primarily related to COVID-19 compared to 2019 Contribution of Property Contribution of Property Sumner Square Sumner Square [Member] Sumner Square Vesting Period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period MYLTIP 2017 [Member] MYLTIP two thousand seventeen [Member] 2017 MYLTIP [Member] Consolidation Items [Axis] Consolidation Items [Axis] Stock Option And Incentive Plan And Stock Repurchase Plan [Axis] Stock Option And Incentive Plan And Stock Repurchase Plan [Axis] Stock Option And Incentive Plan And Stock Repurchase Plan [Axis] Parcels of undeveloped land Parcels of undeveloped land Parcels of undeveloped land Real Estate, Other [Member] Real Estate, Other [Member] Lessor, Operating Lease, Payments to be Received, Maturity Lessor, Operating Lease, Payment to be Received, Fiscal Year Maturity [Table Text Block] Beginning Balance Partners' Capital, Including Portion Attributable to Noncontrolling Interest Cumulative Effect, Period of Adoption, Adjustment Cumulative Effect, Period of Adoption, Adjustment [Member] Right of use asset - finance lease deconsolidated Right of use asset - finance lease deconsolidated Right of use asset - finance lease deconsolidated Notes receivable, net Increase (Decrease) in Finance Receivables Lessee, Operating Lease, Liability, Maturity Lessee, Operating Lease, Liability, Maturity [Table Text Block] 601 Massachusetts Avenue Six Zero One Massachusetts Avenue [Member] Six Zero One Massachusetts Avenue Entity Address, Address Line One Entity Address, Address Line One Sum of Coverage Covered by IXP and Excess Coverage for Property and Terrorism Sum of Coverage Covered by IXP and Excess Coverage for Property and Terrorism Sum of Coverage Covered by IXP and Excess Coverage for Property and Terrorism Product and Service [Axis] Product and Service [Axis] Class of Stock [Domain] Class of Stock [Domain] Reedemable deferred stock units, units Temporary Equity, Shares Subscribed but Unissued Interest expense Interest expense Interest Expense Investments in Unconsolidated Joint Ventures Equity Method Investments [Policy Text Block] Per Occurrence Limit of Earthquake Insurance Seattle Per Occurrence Limit of Earthquake Insurance Seattle Per Occurrence Limit of Earthquake Insurance Seattle Coinsurance of program trigger Program Trigger Coinsurance Program Trigger Coinsurance Coverage For Acts Of Terrorism Under TRIA Covered in Excess of Amount Covered by IXP - Terrorism Coverage For Acts Of Terrorism Under TRIA Covered in Excess of Amount Covered by IXP - Terrorism Coverage For Acts Of Terrorism Under TRIA Covered in Excess of Amount Covered by IXP - Terrorism Affiliate of Bernstein Companies [Member] Affiliate of Bernstein Companies [Member] Affiliate of Bernstein Companies Kendall Center future development Kendall Center future development [Member] Kendall Center future development Asset Acquisition [Line Items] Asset Acquisition [Line Items] OP Units for redemption (in shares) Stock Redeemed or Called During Period, Shares Liabilities for Contingent Guarantees Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross Total Office Properties [Member] Total Office Properties [Member] Total Office Properties [Member]. Reclassification Reclassification, Comparability Adjustment [Policy Text Block] Virginia 95 Office Park Virginia Office Park [Member] Virginia Office Park Period from acquisition through December 31, 2022 Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Weighted average price (per unit) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instrument Other than Option, Nonvested, Intrinsic Value Payments on real estate transaction Payments on real estate transaction Payments on real estate transaction Management Service [Member] Management Service [Member] Number of Promote Entities Number of Promote Entities Number of Promote Entities Accrued rental income, net Straight Line Rent 2027 Finite-Lived Intangible Asset, Expected Amortization, Year Five Land Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land Coverage For Acts Of Terrorism Under TRIA Covered in Excess of Amount Covered by IXP - Property and Terrorism Coverage For Acts Of Terrorism Under TRIA Covered in Excess of Amount Covered by IXP - Property and Terrorism Coverage For Acts Of Terrorism Under TRIA Covered in Excess of Amount Covered by IXP - Property and Terrorism Name of Property [Axis] Name of Property [Axis] Deposit on mortgage note payable interest rate lock Payments for (Proceeds from) Deposit on Loan Redemption of operating partnership units to common stock, shares Conversion of redeemable partnership units Stock Issued During Period, Shares, Conversion of Units Type of Adoption [Domain] Accounting Standards Update [Domain] General and administrative General and administrative expense General and Administrative Expense Assumption of mortgage notes payable Noncash or Part Noncash Acquisition, Debt Assumed Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Unsecured debt interest coverage ratio Unsecured debt interest coverage ratio Unsecured debt interest coverage ratio Lessor Disclosure [Abstract] Lessor Disclosure [Abstract] Dividends [Axis] Dividends [Axis] Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Salaries And Related Costs Capitalized Salaries And Related Costs Capitalized Salaries And Related Costs Capitalized Vesting Percentage Vesting Percentage Vesting percentage Real Estate, Type of Property [Axis] Real Estate, Type of Property [Axis] Investments In Unconsolidated Joint Ventures Equity Method Investments and Joint Ventures Disclosure [Text Block] Retail Site [Member] Retail Site [Member] Impairment loss Asset Impairment Charges Investments In Unconsolidated Joint Ventures [Abstract] Investments In Unconsolidated Joint Ventures [Abstract] Investments In Unconsolidated Joint Ventures [Abstract] Treasury Stock Treasury Stock [Policy Text Block] Treasury Stock Redeemable partnership units— 16,535,172 and 16,561,186 common units and 1,680,123 and 1,485,376 long term incentive units outstanding at redemption value at September 30, 2022 and December 31, 2021, respectively Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount Lessor, Operating Lease, Lease Not yet Commenced, Description Lessor, Operating Lease, Lease Not yet Commenced, Description Gateway Commons Complex Future Development[Member] [Member] Gateway Commons Complex Future Development[Member] [Member] Gateway Commons Complex Future Development[Member] [Member] 501 K Street LLC [Member] five zero one K Street LLC [Member] 501 K Street LLC [Member] Amount of earthquake insurance provided by IXP, LLC as direct insurer San Francisco and Los Angeles Amount Of Earthquake Insurance Provided By IXP LLC As Direct Insurer San Francisco and Los Angeles Amount Of Earthquake Insurance Provided By IXP LLC As Direct Insurer San Francisco and Los Angeles Accounting Standards Update [Extensible List] Accounting Standards Update [Extensible Enumeration]