Corporate Office Properties Trust to Present at the 2009 NAREIT Institutional Investor Forum

Mr. Griffin will provide an overview of the Company and participate in a question and answer session.

A live audio webcast of the presentation will be available in the Investor Relations section of the Company's website at www.copt.com. The replay will be available beginning June 4, 2009 at approximately 12:00 p.m. Eastern Time and will be available until July 31, 2009.

Company Information

Corporate Office Properties Trust (COPT) (NYSE:OFC) is a specialty office real estate investment trust (REIT) that focuses on strategic customer relationships and specialized tenant requirements in the U.S. Government, Defense Information Technology and Data sectors. The Company acquires, develops, manages and leases properties which are typically concentrated in large office parks primarily located adjacent to government demand drivers and/or in growth corridors. As of March 31, 2009, the Company owned 259 office and data properties totaling 19.4 million rentable square feet, which includes 19 properties totaling 852,000 square feet held through joint ventures. The Company's portfolio primarily consists of technically sophisticated buildings in visually appealing settings that are environmentally sensitive, sustainable and meet unique customer requirements. COPT is an S&P MidCap 400 company and more information can be found at www.copt.com.

Forward-Looking Information

This press release may contain "forward-looking" statements, as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, that are based on the Company's current expectations, estimates and projections about future events and financial trends affecting the Company. Forward-looking statements can be identified by the use of words such as "may," "will," "should," "expect," "estimate" or other comparable terminology. Forward-looking statements are inherently subject to risks and uncertainties, many of which the Company cannot predict with accuracy and some of which the Company might not even anticipate. Accordingly, the Company can give no assurance that these expectations, estimates and projections will be achieved. Future events and actual results may differ materially from those discussed in the forward-looking statements.

Important factors that may affect these expectations, estimates, and projections include, but are not limited to:

-- the Company's ability to borrow on favorable terms;

-- general economic and business conditions, which will, among other things, affect office property demand and rents, tenant creditworthiness, interest rates and financing availability;

-- adverse changes in the real estate markets including, among other things, increased competition with other companies;

-- risk of real estate acquisition and development, including, among other things, risks that development projects may not be completed on schedule, that tenants may not take occupancy or pay rent or that development or operating costs may be greater than anticipated;

-- risks of investing through joint venture structures, including risks that the Company's joint venture partners may not fulfill their financial obligations as investors or may take actions that are inconsistent with the Company's objectives;

-- our ability to satisfy and operate effectively under federal income tax rules relating to real estate investment trusts and partnerships;

-- governmental actions and initiatives; and

-- environmental requirements.

The Company undertakes no obligation to update or supplement any forward-looking statements. For further information, please refer to the Company's filings with the Securities and Exchange Commission, particularly the section entitled "Risk Factors" in Item 1A of the Company's Annual Report on Form 10-K for the year ended December 31, 2008.

SOURCE: Corporate Office Properties Trust

Corporate Office Properties Trust 
Mary Ellen Fowler 
Senior Vice President and Treasurer 
443-285-5450 
maryellen.fowler@copt.com