CORPORATE OFFICE PROPERTIES TRUST
CERTIFICATIONS REQUIRED BY
RULE 13a-14(b) UNDER THE SECURITIES EXCHANGE ACT OF 1934
In connection with the Annual Report on Form 10-K of Corporate Office Properties Trust (the "Company") for the year ended December 31, 2010, as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, Randall M. Griffin, Chief Executive Officer of the Company, certify that to my knowledge:
(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and
(2) The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.
| /s/ RANDALL M. GRIFFIN Randall M. Griffin Chief Executive Officer |
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Date: February 11, 2011 |