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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of

the Securities Exchange Act of 1934

Date of report (Date of earliest event reported): September 10, 2020

CORPORATE OFFICE PROPERTIES TRUST

CORPORATE OFFICE PROPERTIES, L.P.

(Exact name of registrant as specified in its charter)

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.)

6711 Columbia Gateway Drive, Suite 300

Columbia, Maryland 21046

(Address of principal executive offices)

(443) 285-5400

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class |  | Trading Symbol(s) |  | Name of each exchange on which registered
Common Shares of beneficial interest, $0.01 par value |  | OFC |  | New York Stock Exchange

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):

¨ | Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
¨ | Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
¨ | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
¨ | 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).

Emerging Growth Company (Corporate Office Properties Trust) ¨

Emerging Growth Company (Corporate Office Properties, L.P.) ¨

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. ¨

Corporate Office Properties Trust ¨

Corporate Office Properties, L.P. ¨

| Item 8.01. | Other Events.

Corporate Office Properties Trust and Corporate Office Properties, L.P. are filing this Current Report on Form 8-K solely in order to file as an exhibit hereto certain operating and financial information.

| Item 9.01. | Financial Statements and Exhibits

Exhibit Number |  | Exhibit Title
99.1 |  | Corporate Office Properties Trust Supplemental Operating and Financial Information.
104 |  | Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has 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: | September 10, 2020 | Dated: | September 10, 2020

Co-Registrant CIK | 0001067063
Co-Registrant Amendment Flag | false
Co-Registrant Form Type | 8-K
Co-Registrant DocumentPeriodEndDate | 2020-09-10
Co-Registrant Written Communications | false
Co-Registrant Solicitating Materials | false
Co-Registrant PreCommencement Tender Offer | false
Co-Registrant PreCommencement Issuer Tender Offer | false
Co-Registrant AddressLine1 | 6711 Columbia Gateway Drive
Co-Registrant AddressLine2 | Suite 300
Co-Registrant City | Columbia
Co-Registrant State | Maryland
Co-Registrant ZipCode | 21046
Co-Registrant CityAreaCode | 443
Co-Registrant LocalPhoneNumber | 285-5400