COPT DEFENSE PROPERTIES — Director's Dealing 2021

May 4, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: CORPORATE OFFICE PROPERTIES TRUST (OFC)
CIK: 0000860546
Period of Report: 2021-05-03

Reporting Person: DENTON ROBERT L (Director)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-05-03	Common Units -- COPLP	$28.032	J		Disposed		Common Shares (3500)	Direct

Footnotes

F1: The reporting person redeemed 3,500 common units of limited partnership interest ("Common Units") of Corporate Office Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 3,500 shares, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day trailing average of the closing prices of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.

F2: Common Units are convertible upon issuance.