FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF 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 *
  SINGER KAREN M
 2. Date of Event Requiring Statement (Month/Day/Year)
02/09/2004		 3. Issuer Name and Ticker or Trading Symbol
CORPORATE OFFICE PROPERTIES TRUST [OFC]
(Last)
(First)
(Middle)
11741 GREENSPRING AVENUE		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
VP, General Counsel & Sec
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

LUTHERVILLE, MD 21093		 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 Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Shares 200
D
 
Common Shares 4,818 (1)
D
 
Common Shares 2,202 (2)
D
 

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Options to Acquire Common Stock 06/01/2003(3) 06/01/2009 Options to Acquire Common Stock 8,000 $ 8 D  
Options to Acquire Common Stock 05/30/2003(5) 05/30/2010 Options to Acquire Common Stock 8,000 $ 8.625 D  
Options to Acquire Common Stock 01/29/2004(4) 01/29/2011 Options to Acquire Common Stock 8,000 $ 9.54 D  
Options to Acquire Common Stock 01/01/2002(6) 01/01/2012 Options to Acquire Common Stock 25,000 $ 11.87 D  
Options to Acquire Common Stock 01/01/2005(7) 01/01/2014 Options to Acquire Common Stock 7,500 $ 20.34 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
SINGER KAREN M
11741 GREENSPRING AVENUE
LUTHERVILLE, MD 21093		       VP, General Counsel & Sec  

Signatures

Karen Miller Singer 02/09/2004
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(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) Restricted Stock granted on 1/31/03, which vests on annual basis starting on first anniversary of grant and for four years thereafter in the following percentages: 16%, 18%, 20%, 22% and 24%.
(2) Restricted Stock granted on 1/31/04, which vests on annual basis starting on first anniversary of grant and for four years thereafter in the following percentages: 16%, 18%, 20%, 22% and 24%.
(3) All Options fully vested as of 6/1/02.
(4) All options fully vested as of 1/29/04
(5) All Options fully vested as of 5/30/03
(6) 6,250 Options vested on the date of grant and balance of Options vest on each anniversary thereafter in the amount of 6,250 Options per year.
(7) Options vest in thirds (2,500 options per year) commencing on the first anniversary of the grant

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