COPT Defense Properties of Beneficial Interest Watch

from S-8 1 page Third Amendment to Corporate Office Properties Trust 2017 Omnibus Equity and Incentive Plan

from 8-K 120 pages Corporate Office Properties, L.P., as Company, Corporate Office Properties Trust, as Guarantor, and U.S. Bank Trust Company, National Association, as Trustee Indenture Dated as of September 12, 2023 5.25% Exchangeable Senior Notes Due 2028

from 8-K 27 pages Corporate Office Properties, L.P. as Issuer Corporate Office Properties Trust as Guarantor and U.S. Bank National Association as Trustee Fourth Supplemental Indenture Dated as of November 17, 2021 $400,000,000 2.900% Senior Notes Due 2033 Supplement to Indenture Dated as of April 8, 2019, Among Corporate Office Properties, L.P. (As Issuer), Corporate Office Properties Trust (As Guarantor) and U.S. Bank National Association

from 8-K 26 pages Corporate Office Properties, L.P. as Issuer Corporate Office Properties Trust as Guarantor and U.S. Bank National Association as Trustee Third Supplemental Indenture Dated as of August 11, 2021 $400,000,000 2.000% Senior Notes Due 2029 Supplement to Indenture Dated as of April 8, 2019, Among Corporate Office Properties, L.P. (As Issuer), Corporate Office Properties Trust (As Guarantor) and U.S. Bank National Association

from 8-K 26 pages Corporate Office Properties, L.P. as Issuer Corporate Office Properties Trust as Guarantor and U.S. Bank National Association as Trustee Second Supplemental Indenture Dated as of March 11, 2021 $600,000,000 2.750% Senior Notes Due 2031 Supplement to Indenture Dated as of April 8, 2019, Among Corporate Office Properties, L.P. (As Issuer), Corporate Office Properties Trust (As Guarantor) and U.S. Bank National Association

from 8-K 24 pages Corporate Office Properties, L.P. as Issuer Corporate Office Properties Trust as Guarantor and U.S. Bank National Association as Trustee First Supplemental Indenture Dated as of September 17, 2020 $400,000,000 2.250% Senior Notes Due 2026 Supplement to Indenture Dated as of April 8, 2019, Among Corporate Office Properties, L.P. (As Issuer), Corporate Office Properties Trust (As Guarantor) and U.S. Bank National Association

from 8-K 8 pages Corporate Office Properties, L.P. 2.250% Senior Notes Due 2026

from 10-K 3 pages Description of Common Shares of Corporate Office Properties Trust

from S-3ASR 86 pages Corporate Office Properties, L.P. Issuer Corporate Office Properties Trust Guarantor — And — U.S. Bank National Association, Trustee Indenture Dated as of April 8, 2019 Debt Securities Guarantees of Debt Securities Certain Sections of This Indenture Relating to the Trust Indenture Act of 1939

from 8-K 24 pages Corporate Office Properties, L.P. as Issuer Corporate Office Properties Trust as Guarantor and U.S. Bank National Association as Trustee Third Supplemental Indenture Dated as of June 29, 2015 $300,000,000 5.00% Senior Notes Due 2025 Supplement to Indenture Dated as of September 16, 2013, Among Corporate Office Properties, L.P. (As Issuer), Corporate Office Properties Trust (As Guarantor) and U.S. Bank National Association

from 8-K 8 pages Corporate Office Properties, L.P. 5.00% Senior Notes Due 2025

from 8-K 24 pages Corporate Office Properties, L.P. as Issuer Corporate Office Properties Trust as Guarantor and U.S. Bank National Association as Trustee Second Supplemental Indenture Dated as of May 21, 2014 $300,000,000 3.700% Senior Notes Due 2021 Supplement to Indenture Dated as of September 16, 2013, Among Corporate Office Properties, L.P. (As Issuer), Corporate Office Properties Trust (As Guarantor) and U.S. Bank National Association

from 8-K 8 pages Corporate Office Properties, L.P. 3.700% Senior Notes Due 2021

from 8-K 23 pages Corporate Office Properties, L.P. as Issuer Corporate Office Properties Trust as Guarantor and U.S. Bank National Association as Trustee First Supplemental Indenture Dated as of September 16, 2013 $250,000,000 5.25% Senior Notes Due 2024 Supplement to Indenture Dated as of September 16, 2013, Among Corporate Office Properties, L.P. (As Issuer), Corporate Office Properties Trust (As Guarantor) and U.S. Bank National Association (As Trustee) 1

from 8-K 8 pages Corporate Office Properties, L.P. 5.25% Senior Notes Due 2024

from S-3ASR 86 pages Corporate Office Properties, L.P. Issuer Corporate Office Properties Trust Guarantor — And — U.S. Bank National Association, Trustee Indenture Dated as of [ ], 2013 Debt Securities Guarantees of Debt Securities Certain Sections of This Indenture Relating to the Trust Indenture Act of 1939

from 8-K 23 pages Registration Rights Agreement

from 8-K 93 pages Dated as of May 6, 2013 Corporate Office Properties, L.P., as Issuer Corporate Office Properties Trust, as Guarantor U.S. Bank National Association, as Trustee 3.600% Senior Notes Due 2023 Indenture

from 8-A12B 2 pages Fully Paid and Non-Assessable 7.375% Series L Cumulative Preferred Shares of Beneficial Interest, Corporate Office Properties Trust (The “Trust”) Transferable on the Books of the Trust by the Holder Hereof in Person or by Its Duly Authorized Attorney Upon Surrender of This Certificate Properly Endorsed. This Certificate and the Shares Represented Hereby Are Issued and Shall Be Held Subject to All of the Provisions of the Declaration of Trust and Bylaws of the Trust and Any Amendments Hereto. This Certificate Is Not Valid Unless Countersigned and Registered by the Transfer Agent and Registrar. in Witness Whereof, the Trust Has Caused This Certificate to Be Executed on Its Behalf by Its Duly Authorized Officers. Dated: American Financial Printing Incorporated – Minneapolis This Certifies That Is the Owner of Corporate Office Properties Trust a Real Estate Investment Trust Formed Under the Laws of the State of Maryland Preferred Stock See Reverse Side for Certain Definitions Cusip 22002t 884 Secretary President and Chief Executive Officer Countersigned and Registered: Wells Fargo Bank, N.A. Transfer Agent and Registrar by Authorized Signature CL

from 8-A12B 19 pages Articles Supplementary of Corporate Office Properties Trust Series L Cumulative Preferred Shares