FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
HAMLIN CLAY W III
   2. Issuer Name and Ticker or Trading Symbol
CORPORATE OFFICE PROPERTIES TRUST [OFC] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
6711 COLUMBIA GATEWAY DRIVE, SUITE 300		 3. Date of Earliest Transaction (Month/Day/Year)
08/02/2013
(Street)

COLUMBIA, MD 21046		 4. If Amendment, Date Original Filed(Month/Day/Year)
06/25/2013		 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Units of Corporate Office Properties, L.P. 06/25/2013   G V 1,870 A (6) 1,025,912 (7) D  
Common Units-COPLP 08/02/2013   C   10,000 D (4) 1,015,912 (3) D  
Common Shares-COPT 08/02/2013   M   10,000 A (1) 20,390 (2) D  
Common Shares-COPT 08/02/2013   S   10,000 (5) D $ 25.5586 10,390 D  

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
HAMLIN CLAY W III
6711 COLUMBIA GATEWAY DRIVE
SUITE 300
COLUMBIA, MD 21046		   X      

Signatures

 Karen M. Singer, by Power of Attorney   08/05/2013
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Acquired through conversion of COPLP Units.
(2) These shares are owned as follows: 10,000 shares are owned by LBCW,L.P. as a result of this conversion and 10,390 shares are owned by Clay W. Hamlin, III.
(3) The 1,015,912 units are owned as follows: 63,394 by Clay W. Hamlin, III; 831,107 by LBCW, L.P.; and 121,411 by Lynn Hamlin.
(4) These COPLP Units were converted into Common Shares of COPT.
(5) 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.
(6) These units were donated to a charitable organization. The Form 4 filed on 7/1/13 reported this number erroneously as 2,020 units.
(7) The 1,025,912 units in Corporate Office Properties, L.P. are owned as follows: 63,394 by Clay W. Hamlin, III; 841,107 by LBCW, L.P. (taking into account transactions which occurred after 7/1/13 Form 4 Filing); and 121,411 by Lynn Hamlin.

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