Common use of Twenty Clause in Contracts

Twenty. Second Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated January 9, 2007 (filed with the Company’s Current Report on Form 8-K dated January 16, 2007 and incorporated herein by reference).

Twenty. Second First Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated January 9July 20, 2007 2006 (filed with the Company’s Current Report on Form 8-K dated January 16July 26, 2007 2006 and incorporated herein by reference).