6711 Columbia Gateway Drive, Suite 300
Columbia, Maryland 21046-2104
Telephone 443-285-5400
Facsimile 443-285-7650
www.copt.com
NYSE: OFC

July 12, 2013

VIA EDGAR

Securities and Exchange Commission

Division of Corporation Finance

100 F Street, N.E.

Washington, DC 20549

Attn: Tom Kluck, Branch Chief

Re:Corporate Office Properties, L.P.

Corporate Office Properties Trust

Registration Statement on Form S-4 (Filing No. 333-189188)

Dear Mr. Kluck:

As per a conversation on July 11, 2013, between Justin W. Chairman of Morgan, Lewis & Bockius LLP and Kristina Aberg of the Staff of the Securities and Exchange Commission, in accordance with Rule 461 under the Securities Act of 1933, as amended, we hereby request the acceleration of the effective date of the above-referenced Registration Statement so that it will become effective Tuesday, July 16, 2013, at 12:00 p.m. Eastern Time or as soon thereafter as practicable.

Sincerely yours,

CORPORATE OFFICE PROPERTIES TRUST

By:	/s/ Stephen E. Riffee
	Stephen E. Riffee
	Executive Vice President and
	Chief Financial Officer
CORPORATE OFFICE PROPERTIES, L.P.
	By:	CORPORATE OFFICE PROPERTIES TRUST
		By:	/s/ Stephen E. Riffee
			Stephen E. Riffee
			Executive Vice President and
			Chief Financial Officer