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FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person*
LINGERFELT DAVID L

(Last)(First)(Middle)
C/O LIBERTY PROPERTY TRUST, 500 CHESTERFIELD PARKWAY

(Street)
MALVERNPA19355

(City)(State)(Zip)
2. Issuer Name and Ticker or Trading Symbol
LIBERTY PROPERTY TRUST [LRY]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
XDirector10% Owner
Officer (give title below)Other (specify below)
3. Date of Earliest Transaction (Month/Day/Year)
09/14/2009
4. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person

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)
CodeVAmount(A) or (D)Price
Common Shares of Beneficial Interest ($0.001 par value) 09/14/2009 M  5,000 A$ 26.6875 47,743 (1) D  
Common Shares of Beneficial Interest ($0.001 par value) 09/14/2009 S  5,000 D$ 32.5 42,743 (1) D  

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 Security3. 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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Employee Stock Option (right to buy) $ 26.6875 09/14/2009 M   5,000  (2)06/23/2010 Common Shares 5,000 (3) 0 D  
Explanation of Responses:
1. Includes 30,674 common shares issuable upon exchange of limited partnership interests of Liberty Property Limited Partnership.
2. Options became exercisable 20% after the first anniversary of the date of the grant, 50% after the second anniversary and fully after the third anniversary.
3. Options received as compensation for service on Board of Trustees.
David L. Lingerfelt by James J. Bowes as Attorney-in-Fact09/16/2009
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

POWER OF ATTORNEY FOR
SECTION 16 REPORTING OBLIGATIONS


The undersigned hereby constitutes and appoints each of James J. Bowes, George
J. Alburger, Jr., Mary Beth Morrissey and Shannon Gomez, acting separately,
his/her true and lawful attorney-in-fact to:

(1)execute for and on behalf of the undersigned, in the undersigned's capacity
as an officer and/or trustee of Liberty Property Trust (the "Company"), Forms 3,
4 or 5 in accordance with Section 16(a) of the Securities Exchange Act of 1934,
as amended, and the rules thereunder;

(2)do and perform any and all acts for and on behalf of the undersigned which
may be necessary or desirable to complete the execution of any such Forms 3, 4
or 5 and the timely filing of such form with the United States Securities and
Exchange Commission and any other authority; and 

(3)take any other action of any type whatsoever in connection with the
foregoing which, in the opinion of such attorney in fact, may be of benefit to,
in the best interest of, or legally required by, the undersigned, it being
understood that the documents executed by such attorney-in-fact on behalf of the
undersigned pursuant to this Power of Attorney shall be in such form and shall
contain such terms and conditions as such attorney-in-fact may approved in
his/her discretion.

The undersigned hereby grants to each such attorney-in-fact full power and
authority to do and perform every act and thing whatsoever requisite, necessary
and proper to be done in the exercise of any of the rights and powers herein
granted, as fully to all intents and purposes as such attorney-in-fact might or
could do if personally present, with full power of substitution or revocation,
hereby ratifying and confirming all that such attorney-in-fact, or his/here
substitute or substitutes, shall lawfully do or cause to be done by virtue of
this Power of Attorney and the rights and powers herein granted.  The
undersigned acknowledges that the foregoing attorney-in-fact, in serving in such
capacity at the request of the undersigned, is not assuming any of the
undersigned's responsibilities to comply with Section 16 of the Securities
Exchange Act of 1934, as amended.


This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4 and 5 with respect to the
undersigned's holdings and transactions in securities issued by the Company,
unless earlier revoked in writing.

IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney on the
27th day of September, 2002.




                                                
                                                /s/ David L. Lingerfelt
Signature


                                                
                                                David L. Lingerfelt
Print Name



 

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