Ownership Submission
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, Section 17(a) of the Public Utility Holding Company Act of 1935 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 *
Breslin Sean J.
   2. Issuer Name and Ticker or Trading Symbol
AVALONBAY COMMUNITIES INC [AVB] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Executive Vice President
(Last)
(First)
(Middle)
C/O AVALONBAY COMMUNITIES, INC., BALLSTON TOWER, 671 N. GLEBE ROAD		 3. Date of Earliest Transaction (Month/Day/Year)
02/14/2011
(Street)

ARLINGTON, VA 22203		 4. If Amendment, Date Original Filed(Month/Day/Year)
 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
Common Stock, par value $.01 per share 02/14/2011   M   1,414 A $ 86.4 8,473.9701 (1) D  
Common Stock, par value $.01 per share 02/14/2011   M   2,699 A $ 48.6 11,172.9701 (1) D  
Common Stock, par value $.01 per share 02/14/2011   M   1,320 A $ 74.2 12,492.9701 (1) D  
Common Stock, par value $.01 per share 02/14/2011   S   5,433 D $ 116.0098 (2) 7,059.9701 (1) 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
Stock Options (Right to Buy) $ 86.4 02/14/2011   M     1,414 02/11/2009(3) 02/11/2018 Common Stock 1,414 $ 0 (3) 1,156 (4) D  
Stock Options (Right to Buy) $ 48.6 02/14/2011   M     2,699 02/11/2010(5) 02/11/2019 Common Stock 2,699 $ 0 (5) 2,703 (6) D  
Stock Options (Right to Buy) $ 74.2 02/14/2011   M     1,320 02/11/2011(7) 02/11/2020 Common Stock 1,320 $ 0 (7) 2,640 (8) D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Breslin Sean J.
C/O AVALONBAY COMMUNITIES, INC.
BALLSTON TOWER, 671 N. GLEBE ROAD
ARLINGTON, VA 22203		       Executive Vice President  

Signatures

 Catherine T. White, as attorney-in-fact under Power of Attorney dated May 26, 2009   02/15/2011
**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) The amount of secuities owned following the reported transaction reflects direct ownership of all shares of common stock, including restricted stock.
(2) This transaction was executed in multiple trades at prices ranging from $116.00 to $116.06. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
(3) The options exercised were included in options granted under the issuer's stock option and incentive plan on February 11, 2008 which became exercisable in three equal installments beginning on February 11, 2009.
(4) Following the reported transaction, the reporting person held a total of 21,585 options to purchase the issuer's common stock granted on various dates and with varying exercise prices and vesting dates.
(5) The options exercised were included in options granted under the issuer's stock option and incentive plan on February 11, 2009 which became exercisable in three equal installments beginning on February 11, 2010.
(6) Following the reported transaction, the reporting person held a total of 18,886 options to purchase the issuer's common stock granted on various dates and with varying exercise prices and vesting dates.
(7) The options exercised were included in options granted under the issuer's stock option and incentive plan on February 11, 2010 which became exercisable in three equal installments beginning on February 11, 2011.
(8) Following the reported transaction, the reporting person holds a total of 17,566 options to purchase the issuer's common stock granted on various dates and with varying exercise prices and vesting dates.

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