Corporate Office Properties Trust Announces New Managing Director of Investments.

COLUMBIA, Md. -- Corporate Office Properties Trust (COPT) (NYSE:OFC) announced today the appointment of John Norjen, Managing Director of Investments. In this role, Mr. Norjen will be responsible for leading the Company's acquisition and disposition efforts.

For the past 20 years, Mr. Norjen has worked for leading institutional firms including Jones Lang LaSalle, CB Richard Ellis and Eastdil Secured where he led the completion of over $5 billion in transactions. Mr. Norjen has been a very accomplished sales advisor in the mid-Atlantic region.

Mr. Norjen is a member of the Urban Land Institute's Office Development Council and the CFA Institute. He is a Chartered Financial Analyst, a General Securities Representative and a licensed real estate broker in Maryland, Virginia and the District of Columbia. Mr. Norjen graduated from Loyola College in Baltimore, Maryland with a Bachelor of Science in Computer Science and from Rice University in Houston, Texas with a Master of Business Administration in Finance.

"COPT is extremely fortunate to be gaining an experienced and highly qualified individual. John's extensive commercial real estate experience and knowledge will prove most valuable as new opportunities evolve for COPT as a result of the turbulent economic environment," stated Randall M. Griffin, President and Chief Executive Officer of Corporate Office Properties Trust.

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 June 30, 2008, the Company owned 253 office and data properties totaling 19.1 million rentable square feet, which includes 19 properties totaling 847,000 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. More information on COPT 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 1 of the Company's Annual Report on Form 10-K for the year ended December 31, 2007.