COPT DEFENSE PROPERTIES — Director's Dealing 2011

Nov 2, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: CORPORATE OFFICE PROPERTIES TRUST (OFC)
CIK: 0000860546
Period of Report: 2011-10-31

Reporting Person: DENTON ROBERT L (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-10-31	Common Units - COPLP	C	13000	—	Disposed	333000	Direct
2011-10-31	Common Shares - COPT	M	13000	—	Acquired	17000	Direct
2011-10-31	Common Shares-COPT	S	15000	$24.425	Disposed	2000	Direct

Footnotes

F1: Acquired through conversion of COPLP Units.