COPT DEFENSE PROPERTIES — Director's Dealing 2017

May 9, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: CORPORATE OFFICE PROPERTIES TRUST (OFC)
CIK: 0000860546
Period of Report: 2017-05-02

Reporting Person: DENTON ROBERT L (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-05-02	Common Shares	M	5000	$29.98	Acquired	8118	Direct
2017-05-02	Common Shares	S	5000	$33.5056	Disposed	3118	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-05-02	Stock Option (Right to Buy)	$29.98	M	5000	Disposed	2019-05-04	Common Shares (5000)	Direct

Footnotes

F1: Represents the weighted average of a range of sales prices per share from $33.48 to $33.52. The reporting person undertakes to provide to the staff of the Securities and Exchange Commission, the issuer or any shareholder of the issuer, upon request, full information regarding the number of common shares sold at each separate price.

F2: Options granted as compensation for service on Board of Trustees.