Corporate Office Properties Trust Announces Second Quarter 2007 Earnings Conference Call.

COLUMBIA, Md. -- Corporate Office Properties Trust (COPT) (NYSE:OFC) will report financial results for the second quarter 2007 after the market close on Wednesday, August 1, 2007. Please join Randall M. Griffin, President and Chief Executive Officer, Roger A. Waesche, Jr., Executive Vice President and Chief Operating Officer, Stephen E. Riffee, Executive Vice President and Chief Financial Officer and Mary Ellen Fowler, Vice President and Treasurer for a conference call and live webcast on Thursday, August 2, 2007 at 11:00 a.m. Eastern Time to discuss these results.

                 Conference Call and Webcast

                 Date:                Thursday, August 2, 2007

                 Time:                11:00 a.m. Eastern Time

                 Telephone Number:    866-713-8566

                 Passcode:            97519594

Please dial into the conference 5 to 10 minutes before the start of the call. A replay of this call will be available beginning Thursday, August 2, 2007 at 2:00 p.m. Eastern Time through Thursday, August 16, 2007 at midnight Eastern Time. To access the replay, please call 888-286-8010 and use passcode 18361175.

The conference call will also be available via live webcast in the Investor Relations section of the Company's website at www.copt.com. A replay of the conference call will be immediately available via webcast in the Investor Relations section of the Company's website.

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 March 31, 2007, the Company owned 244 office properties totaling 18.2 million rentable square feet, which included 18 properties totaling 806,000 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, 2006.