X0306 4 2020-03-01 0 0000860546 CORPORATE OFFICE PROPERTIES TRUST OFC 0001349211 Mifsud Anthony 6711 COLUMBIA GATEWAY DRIVE SUITE 300 COLUMBIA MD 21046 0 1 0 0 EVP and CFO Common Shares 2020-03-01 4 F 0 824 25.34 D 51225 D Common Shares 2020-03-01 4 F 0 1406 25.34 D 49819 D Profit Interest Units 2020-03-01 4 A 0 13513 0 A Common Shares 13513 24176 D These shares were forfeited in a net share settlement in connection with restrictions lapsing on restricted shares. Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in Corporate Office Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of its capital account balance. OP Units are redeemable for cash, or, at the option of Corporate Office Properties Trust, exchangeable for common shares of Corporate Office Properties Trust, currently on a one-for-one basis. Represents Profit Interest Units issued pursuant to the Corporate Office Properties Trust 2017 Omnibus Equity and Incentive Plan. The Profit Interest Units will vest in three equal installments over a three-year period. This form amends the report to (i) remove an award of securities erroneously reported as restricted shares on Table I and update the total amount of securities beneficially owned following the reported transaction and (ii) report such award of securities as Profit Interest Units (as described below) on Table II. David L. Finch, by Power of Attorney 2020-03-03