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Corporate Office Properties Trust	Maryland	1-14023	23-2947217
	(State or other jurisdiction of	(Commission File	(IRS Employer
	incorporation or organization)	Number)	Identification No.)

Corporate Office Properties, L.P.	Delaware	333-189188	23-2930022
	(State or other jurisdiction of	(Commission File	(IRS Employer
	incorporation or organization)	Number)	Identification No.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2 below):



o		Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
o		Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
o		Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
o		Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

On April 27, 2017, Corporate Office Properties Trust (the “Company”) issued a press release relating to its financial results for the three months ended March 31, 2017 and, in connection with this release, is making available certain supplemental information pertaining to its properties and operations as of and for the period ended March 31, 2017. The earnings release and supplemental information are included as Exhibit 99.1 to this report and are incorporated herein by reference.

The information included herein, including the exhibits, shall not be deemed “filed” for any purpose, including the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or subject to liabilities of that Section. The information included herein, including the exhibits, shall also not be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act regardless of any general incorporation language in such filing.



(a)	Financial Statements of Businesses Acquired

	None

(b)	Pro Forma Financial Information

	None

(c)	Shell Company Transactions

	None

(d)	Exhibits



Exhibit Number		Exhibit Title
99.1		Corporate Office Properties Trust earnings release and supplemental information for the period ended March 31, 2017, including the press release dated April 27, 2017

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrants have duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.



	CORPORATE OFFICE PROPERTIES TRUST		CORPORATE OFFICE PROPERTIES, L.P.
			By: Corporate Office Properties Trust,
			its General Partner


	/s/ Anthony Mifsud		/s/ Anthony Mifsud
	Anthony Mifsud		Anthony Mifsud
	Executive Vice President and Chief Financial Officer		Executive Vice President and Chief Financial Officer

Dated:	April 27, 2017	Dated:	April 27, 2017



Exhibit Number		Exhibit Title
99.1		Corporate Office Properties Trust earnings release and supplemental information for the period ended March 31, 2017, including the press release dated April 27, 2017