Corporate Office Properties Trust Announces Offering of 1.4 Million Preferred Shares.

Business Editors

COLUMBIA, Md.--(BUSINESS WIRE)--Dec. 10, 2003

Corporate Office Properties Trust (NYSE:OFC) announced today the launch of an underwritten public offering of 1,400,000 shares of Series H Cumulative Redeemable Preferred Shares.

Credit Suisse First Boston LLC and Wachovia Securities are joint book-running managers, with A.G. Edwards & Sons, Inc. and Legg Mason Wood Walker Incorporated as co-managers. The underwriters are expected to be granted a 30-day over-allotment option to purchase up to an additional 210,000 preferred shares.

A copy of the prospectus supplement and base prospectus related to the offering, when available, may be obtained from Wachovia Securities, ATTN: Prospectus Department, 8739 Research Drive, Charlotte, North Carolina 28262, or 704-593-7559.

A registration statement relating to these securities has been filed with and declared effective by the Securities and Exchange Commission. This announcement shall not constitute an offer to sell or a solicitation of an offer to buy the Company's securities, nor shall there be any sale or an offer to buy these securities in any state in which such offer or solicitation would be unlawful prior to registration or qualification under the securities laws of any such state.

Company Information

Corporate Office Properties Trust is a fully integrated, self-managed, real estate investment trust which focuses on the ownership, management, leasing, acquisition and development of suburban office properties located in the Mid-Atlantic region. The Company currently owns 118 office properties totaling 9.9 million rentable square feet, including three properties held through joint ventures. Corporate Development Services, the Company's development company, provides a wide range of development and construction management services. In addition, Corporate Office Services provides land planning, design/build services, consulting and merchant development to third party entities. 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;

-- governmental actions and initiatives;

-- and environmental requirements.