Corporate Office Properties Trust Further Strengthens Senior Management Team.

COLUMBIA, Md. -- Corporate Office Properties Trust (COPT) (NYSE:OFC) announced today that it has further strengthened its senior management team with the following appointments.

Mary Ellen Fowler has been appointed Vice President and Treasurer, becoming an officer of the Company. In this newly created position, Ms. Fowler is responsible for the Company's cash management and capital markets functions, in addition to her current responsibilities for investor relations and marketing. Ms. Fowler has been with COPT for 5 years and has added considerable value in that time. In her new position, Ms. Fowler will report to Stephen E. Riffee, Executive Vice President and Chief Financial Officer (CFO).

Stephen B. Kutzer has been named Chief Information Officer (CIO), a newly created position at COPT. Mr. Kutzer is responsible for all aspects of information technology including infrastructure and operations and enterprise applications. Mr. Kutzer will also report to Mr. Riffee. Mr. Kutzer was most recently with CarrAmerica Realty Corporation in Washington, DC as Senior Vice President, Information Technology. He joined CarrAmerica in 2002 as Vice President, Information Technology Operations. Prior to his tenure at CarrAmerica, Mr. Kutzer held positions with KPMG Consulting, The World Health Organization and James Martin & Co. Mr. Kutzer graduated from George Washington University with a Master of Science in Information Systems Technology.

Colleen Crews has been named Vice President and Controller. Ms. Crews is responsible for all aspects of the accounting department including general ledger maintenance, cash receipts and disbursements, fixed assets and financial and SEC reporting. Ms. Crews will also report to Mr. Riffee. Ms. Crews has 15 years of real estate experience in the commercial and multi-family sectors, most recently as Assistant Vice President and Assistant Controller for The Town & Country Trust. Prior to that, Ms. Crews was with Ernst & Young LLP. Ms. Crews graduated from Loyola College with a Bachelor of Business Administration in Accounting and is a Certified Public Accountant.

"COPT is privileged to be gaining two very experienced and knowledgeable senior managers. The expertise that they bring to COPT will prove valuable in their management positions," stated Stephen E. Riffee, Executive Vice President and CFO. "We are also pleased to promote Mary Ellen to the Treasurer role as it adds to her extensive knowledge and financial skill set. We are excited about her growth within the Company and thank her for her contributions to date," he added.

Company Information

Corporate Office Properties Trust (COPT) is a fully integrated, self-managed real estate investment trust (REIT) that focuses on the ownership, management, leasing, acquisition and development of suburban office properties located primarily in submarkets within the Greater Washington, DC region. As of June 30, 2006, the Company owned 189 office properties totaling 15.8 million rentable square feet, which included 19 properties totaling 963,000 square feet held through joint ventures. The Company has implemented a core customer expansion strategy that is built around meeting, through acquisitions and development, the multi-location requirements of the Company's existing strategic tenants. The Company's property management services team provides comprehensive property and asset management to company owned properties and select third party clients. The Company's development and construction services team provides a wide range of development and construction management services for company owned properties, as well as land planning, design/build services, consulting, and merchant development to select third party clients. The Company's shares are traded on the New York Stock Exchange under the symbol OFC. More information on Corporate Office Properties Trust can be found on the Internet 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, 2005.