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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
860546	Corporate Office Properties Trust	OFC	Real Estate Investment Trusts (6798)	232947217

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1048456	Iii W Clay Hamlin	6711 Columbia Gateway Drive Suite 300 Columbia MD 21046		Yes	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Units-Coplp	Disposition	2012-04-02	5,000	$0.00	1,504,560	No	4	C	Indirect	See Footnote
Common Shares-Copt	Acquisiton	2012-04-02	5,000	$0.00	9,000	No	4	M	Indirect	See Footnote
Common Shares-Copt	Disposition	2012-04-02	5,000	$23.17	4,000	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	C	Indirect	See Footnote
No	4	M	Indirect	See Footnote
No	4	S	Direct

Footnotes

Acquired through conversion of COPLP Units.
These shares are owned as follows: 5,000 shares are owned by LBCW Limited Partnership as a result of this conversion and 4,000 shares are owned by Clay W. Hamlin, III.
The 1,504,560 units are owned as follows: 87,042 by Clay W. Hamlin, III; 1,296,107 by LBCW; L.P.; and 121,411 by Lynn Hamlin.
These COPLP Units were converted into Common Shares of COPT.
The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by LBCW, L.P. on December 14, 2011.