Corporate Realty Management Places Third in the Nation on Independent Tenant Satisfaction Survey.

Business Editors

COLUMBIA, Md.--(BUSINESS WIRE)--March 13, 2003

Corporate Realty Management (CRM), the property management subsidiary of Corporate Office Properties Trust (NYSE: OFC), placed 58 of its buildings on the "A" list for 2002, as measured by an independent tenant satisfaction survey conducted by CEL & Associates, Inc. of Los Angeles. This result improved from 37 "A" list buildings during 2001. The CEL survey results ranked the company third nationally among all peer group real estate organizations, regarding the overall quality and level of property management services provided to its tenants.

The rankings by CEL & Associates are based on surveys soliciting tenant opinions in eight different categories including: appearance of property, quality of management services, readiness to solve problems, renewal intention and the relationship with the property's on-site management team. Of the 58 recognized buildings, 32 are located in Maryland, thirteen are in Pennsylvania, twelve are located in New Jersey and one is in Northern Virginia.

"Creating and maintaining complete tenant satisfaction on a daily basis is the number one priority of the CRM team," stated Michael D. Kaiser, President of Corporate Realty Management. "From the property managers on the front line to the accounting professionals and administrative staff, we understand the competitive nature of real estate, and the importance of quality property management in distinguishing us from our competition. It is extremely gratifying to receive this favorable feedback from our tenants," he added.

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 select Mid-Atlantic submarkets. The Company currently owns 111 office properties totaling 9.1 million rentable square feet. 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 contains forward-looking information based upon the Company's current best judgment and expectations. Actual results could vary from those presented herein. The risks and uncertainties associated with the forward-looking information include the strength of the commercial office real estate market in which the Company operates, competitive market conditions, general economic growth, interest rates and capital market conditions. For further information, please refer to the Company's filings with the Securities and Exchange Commission.