Item 1.01. Entry into a Material Definitive Agreement

On November 17, 2021, Corporate Office Properties, L.P. ("COPLP"), the operating partnership of Corporate Office Properties Trust ("COPT"), consummated the offering of $400,000,000 aggregate principal amount of its 2.900% Senior Notes due 2033 (the "Notes"). The Notes will be fully and unconditionally guaranteed by COPT. The Notes were offered pursuant to an effective shelf registration statement on Form S-3 (File No. 333-230764 and No. 333-230764-01) filed by COPT and COPLP with the Securities and Exchange Commission on April 8, 2019 (the "Registration Statement"), including a base prospectus, dated April 8, 2019, and a prospectus supplement, dated November 2, 2021, filed with the Securities and Exchange Commission on November 4, 2021.

The terms of the Notes are governed by a senior indenture, dated as of April 8, 2019, by and among COPLP, as issuer, COPT, as guarantor, and U.S. Bank National Association, as trustee (the "Base Indenture"), as supplemented and amended by a fourth supplemental indenture thereto, dated as of November 17, 2021 (the "Fourth Supplemental Indenture").

A copy of the Base Indenture was previously filed as Exhibit 4.1 to the Registration Statement and is incorporated by reference herein. The Fourth Supplemental Indenture is filed as Exhibit 4.2 hereto.

Item 9.01. Financial Statements and Exhibits






Exhibit
Number                                  Exhibit Title
  4.1        Form of 2.900% Senior Notes due 2033 (included in Exhibit 4.2
           below).
  4.2        Fourth Supplemental Indenture, by and among Corporate Office
           Properties, L.P., as issuer, Corporate Office Properties Trust, as
           guarantor, and U.S. Bank National Association, as trustee.
  5.1        Opinion of Saul Ewing LLP regarding the validity of the Guarantee.
  5.2        Opinion of Morgan, Lewis & Bockius LLP regarding the validity of the
           Notes.
  8.1        Opinion of Morgan, Lewis & Bockius LLP.
  23.1       Consent of Saul Ewing LLP (contained in Exhibit 5.1).
  23.2       Consent of Morgan, Lewis & Bockius LLP (contained in Exhibit 5.2).
  23.3       Consent of Morgan, Lewis & Bockius LLP (contained in Exhibit 8.1).
104        Cover Page Interactive Data File (embedded within the Inline XBRL
           document).

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