Corporate Office Properties Trust Was the Winner of the 2007 National Commercial Real Estate Customer Service Award for Excellence.

COLUMBIA, Md. -- Corporate Office Properties Trust (COPT) (NYSE:OFC) announced today that it has achieved the "Best In The Industry" ranking for 2007 by CEL & Associates, Inc. for commitment to the highest level of quality and service to their tenants. The Company won the 2007 National Commercial Real Estate Customer Service Award for Excellence for Category I properties, also referred to as the "A List" Award. Category I is for companies owning over 100 properties, the largest of the categories. CEL & Associates, Inc. is the nation's largest surveyor of tenant satisfaction within the real estate industry. This is the fourth year in a row that the Company has been the winner in the largest owner category.

In addition, the Company has 130 buildings that received the property level "A List" Award, an improvement from 121 buildings in 2006 and 11 buildings in 2000, COPT's first year of participation in the survey. To qualify for the "A List" Award, each property must achieve a 50% minimum tenant response rate and a Service Index score of 85 or above which is based on specific success factors - readiness to solve problems, responsiveness and follow-through, quality of management services, quality of leasing services, relationship rating and renewal retention.

"COPT is extremely proud to be the winner of this award for the fourth year in a row and to say that its properties are rated the highest in the nation for tenant satisfaction scores," stated Randall M. Griffin, President and Chief Executive Officer for Corporate Office Properties Trust. "The fact that we increased our scores from the previous year in all categories is a testament to our Company's continual commitment to exceed tenant expectations through excellent service," he stated.

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. As of December 31, 2007, the Company owned 246 office and data properties totaling 18.6 million rentable square feet, which includes 18 properties totaling 806,000 square feet held through joint ventures. The Company acquires and develops properties which are typically concentrated in large office parks primarily located adjacent to government demand drivers and/or in growth corridors. 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.