News Release Details

BOSTON, March 31 /PRNewswire-FirstCall/ -- Boston Properties, Inc. (NYSE: BXP), a real estate investment trust, announced today that it has been added to the Standard & Poor's 500 Index, a world-renowned index which includes 500 leading companies in leading industries of the U.S. economy.

"Our inclusion in the S&P 500 validates the success of our long-held business strategy as a real estate company -- developing, acquiring and operating premier buildings in carefully selected markets," said Mortimer Zuckerman, Chairman of the Board. "The S&P 500 is one of the most commonly used benchmarks for the overall U.S. stock market and we are honored to be recognized and included in this important index."

Boston Properties is a fully integrated, self-administered and self-managed real estate investment trust that develops, redevelops, acquires, manages, operates and owns a diverse portfolio of Class-A office properties and also includes two hotels. The Company is one of the largest owners and developers of Class-A office properties in the United States, concentrated in five select markets -- Boston, Midtown Manhattan, Washington, D.C., San Francisco, and Princeton, N.J.

Visit the Company's web site at http://www.bostonproperties.com.

This press release contains forward-looking statements within the meaning of the Federal securities laws. You can identify these statements by our use of the words "expects," "plans," "estimates," "projects," "intends," "believes" and similar expressions that do not relate to historical matters. You should exercise caution in interpreting and relying on forward-looking statements because they involve known and unknown risks, uncertainties and other factors which are, in some cases, beyond Boston Properties' control and could materially affect actual results, performance or achievements. These factors include, without limitation, the ability to enter into new leases or renew leases on favorable terms, dependence on tenants' financial condition, the uncertainties of real estate development and acquisition activity, the ability to effectively integrate acquisitions, the costs and availability of financing, the effects of local economic and market conditions, the impact of newly adopted accounting principles on period-to-period comparison of financial results, regulatory changes and other risks and uncertainties detailed from time to time in Boston Properties' filings with the Securities and Exchange Commission. Boston Properties does not undertake a duty to update or revise any forward-looking statement whether as a result of new information, future events or otherwise.

SOURCE  Boston Properties, Inc.
    -0-                             03/31/2006
    /CONTACT:  Kathleen DiChiara, Investor Relations of Boston Properties,
Inc., +1-617-236-3300; General Info: Marilynn Meek, of Financial Relations
Board, +1-212-827-3773, for Boston Properties, Inc./
    /Web site:  http://www.bostonproperties.com /
    (BXP)

CO:  Boston Properties, Inc.
ST:  Massachusetts
IN:  RLT FIN
SU:

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2790 03/31/2006 16:30 EST http://www.prnewswire.com