HRPT Properties Trust Prices 30,000,000 Share Offering

HRPT Properties Trust (NYSE: HRP) today announced it has priced a public offering of 30,000,000 common shares of beneficial interest at a public offering price of $7.25 per share. The settlement of this offering is expected to occur on Wednesday, March 24, 2010. HRP expects to use the net proceeds from this offering to repay amounts outstanding under its $750 million revolving credit facility and fund general business activities, including possible future acquisitions. The underwriters have been granted a 30-day option to purchase up to an additional 4,500,000 shares to cover over allotments, if any. The offering size has been increased from the previously proposed 20,000,000 share offering.

The joint book-running managers for this offering are Morgan Stanley, CITI and Wells Fargo Securities. The co-lead managers for this offering are Jefferies & Company, Morgan Keegan & Company, Inc., RBC Capital Markets and UBS Investment Bank. The co-managers for this offering are Janney Montgomery Scott and Oppenheimer & Co.

This press release is not an offer to sell, nor a solicitation of an offer to buy, shares, nor shall there be any sale of these securities in any state or jurisdiction in which the offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of such state or jurisdiction. Copies of the prospectus supplement and related prospectus may be obtained from the offices of Morgan Stanley & Co. Incorporated, 180 Varick St., 2nd Floor, New York, New York, Attention: Prospectus Department or by email at [e-mail], from the offices of Citigroup Global Markets Inc., Attn: Prospectus Department, Brooklyn Army Terminal, 140 58th Street, 8th Floor, Brooklyn, NY 11220, telephone [phone], or from the offices of Wells Fargo Securities, LLC, Attn: Equity Syndicate Department, 375 Park Avenue, New York, N.Y., 10152 (e-mail: [e-mail] or telephone: [phone]) or by contacting any of the other co-lead managers or co-managers listed above.

WARNING REGARDING FORWARD LOOKING STATEMENTS

THIS PRESS RELEASE INCLUDES FORWARD LOOKING STATEMENTS WITHIN THE MEANING OF THE PRIVATE SECURITIES LITIGATION REFORM ACT OF 1995 AND THE FEDERAL SECURITIES LAWS. THESE FORWARD LOOKING STATEMENTS ARE BASED UPON HRP'S PRESENT BELIEFS AND EXPECTATION, BUT THESE FORWARD LOOKING STATEMENTS ARE NOT GUARANTEED TO OCCUR AND MAY NOT OCCUR FOR VARIOUS REASONS. FOR EXAMPLE:

• THIS PRESS RELEASE STATES THAT THE SETTLEMENT OF THE SALE OF COMMON SHARES IS EXPECTED TO OCCUR ON MARCH 24, 2010. IN FACT, THE SETTLEMENT OF THIS OFFERING IS SUBJECT TO VARIOUS CONDITIONS AND CONTINGENCIES AS ARE CUSTOMARY IN UNDERWRITING AGREEMENTS IN THE UNITED STATES. IF THESE CONDITIONS ARE NOT SATISFIED OR THE SPECIFIED CONTINGENCIES DO NOT OCCUR, THIS OFFERING MAY NOT CLOSE.
• THIS PRESS RELEASE STATES THAT THE UNDERWRITERS HAVE BEEN GRANTED AN OPTION TO PURCHASE UP TO AN ADDITIONAL 4,500,000 COMMON SHARES TO COVER OVER ALLOTMENTS, IF ANY. AN IMPLICATION OF THIS STATEMENT MAY BE THAT THIS OPTION MAY BE EXERCISED IN WHOLE OR IN PART. IN FACT, HRP DOES NOT KNOW WHETHER THE UNDERWRITERS WILL EXERCISE THIS OPTION, OR ANY PART OF IT.

FOR THESE REASONS, AMONG OTHERS, INVESTORS ARE CAUTIONED NOT TO PLACE UNDUE RELIANCE UPON FORWARD LOOKING STATEMENTS.