EXHIBIT 3.1.1

LIBERTY PROPERTY TRUST

ARTICLES SUPPLEMENTARY

473,000 SHARES

7.625% SERIES D CUMULATIVE REDEEMABLE

PREFERRED SHARES OF BENEFICIAL INTEREST

Liberty Property Trust, a Maryland real estate investment trust (the "Company"), hereby certifies to the State Department of Assessments and Taxation of Maryland (the "Department") that:

FIRST: Pursuant to the authority expressly vested in the Board of Trustees of the Company by Sections 3.2(e), 6.1 and 6.3 of the Amended and Restated Declaration of Trust of the Company filed with the Department on May 29, 1997, as supplemented by the Articles Supplementary accepted for record by the Department on August 7, 1997, by the Articles Supplementary accepted for record by the Department on December 23, 1997, by the Articles Supplementary accepted for record by the Department on July 28, 1999, and by the Articles Supplementary accepted for record by the Department on April 18, 2000 (collectively, as supplemented, the "Charter") and Section 8-203 of the Corporations and Associations Article of the Annotated Code of Maryland, the Board of Trustees of the Company (the "Board"), by resolutions duly adopted on March 5, 2002, has classified 473,000 shares of the authorized but unissued shares of beneficial interest in the Company as a series designated the 7.625% Series D Cumulative Redeemable Preferred Shares of Beneficial Interest with the following preferences, conversion and other rights, voting powers, restrictions, limitations as to dividends, qualifications, terms and conditions of redemption, and other terms and conditions:

SECTION 1. Designation and Number. A series of preferred shares of beneficial interest of the Company, designated the "7.625% Series D Cumulative Redeemable Preferred Shares of Beneficial Interest" (the "Series D Preferred Shares") is hereby established. The number of Series D Preferred Shares shall be 473,000. The par value of the Series D Preferred Shares is established to be $0.00l per share.

SECTION 2. Rank. The Series D Preferred Shares will, with respect to distributions and rights upon voluntary or involuntary liquidation, winding-up or dissolution of the Company, rank senior to all classes or series of Common Shares (as defined in the Charter) and to all classes or series of equity securities of the Company now or hereafter authorized, issued or outstanding including, without limitation, the "Series A Junior Participating Preferred Shares" and other than any class or series of equity securities of the Company expressly designated as ranking on a parity with or senior to the Series D Preferred Shares as to distributions and rights upon voluntary or involuntary liquidation, winding-up or dissolution of the Company. For purposes of these Articles Supplementary, the term "Parity Preferred Shares" shall be used to refer to any class or series of equity securities of the Company now or hereafter authorized, issued or outstanding expressly designated by the Company to rank on a parity with Series D Preferred Shares with respect to distributions and rights upon voluntary or involuntary liquidation, winding-up or dissolution of the Company including, without limitation, the "8.80% Series A Cumulative Redeemable Preferred Shares of Beneficial Interest," the "9.25% Series B Cumulative Redeemable Preferred Partnership Interests" and the "9.125% Series C Cumulative Redeemable Preferred Shares." The term "equity securities" does not include debt securities, which will rank senior to the Series D Preferred Shares prior to conversion.

SECTION 3. Distributions.

(a) Payment of Distributions.

(i) Subject to the rights of holders of Parity Preferred Shares and holders of equity securities ranking senior to the Series D Preferred Shares as to payment of distributions, holders of Series D Preferred Shares will be entitled to receive, when, as and if declared by the Board, out of funds legally available for the payment of distributions, cumulative preferential cash distributions at the rate per annum of 7.625% of the $50 liquidation preference per Series D Preferred Share (the "Issuance Rate"). All distributions shall be cumulative, shall accrue from the original date of issuance and will be payable (i) quarterly in arrears, on March 31, June 30, September 30 and December 31 of each year, commencing on the first of such dates to occur after the original date of issuance and, (ii) in the event of a redemption, on the redemption date (each a "Preferred Shares Distribution Payment Date"). The amount of the distribution payable for any period will be computed on the basis of a 360-day year of twelve (12) 30-day months and for any period shorter than a full quarterly period for which distributions are computed, the amount of the distribution payable will be computed based on the ratio of the actual number of days elapsed in such period to ninety (90) days. If any date on which distributions are to be made on the Series D Preferred Shares is not a Business Day (as such term is defined herein), then payment of the distribution to be made on such date will be made on the next succeeding day that is a Business Day (and without any interest or other payment in respect of any such delay) except that, if such Business Day is in the next succeeding calendar year, such payment shall be made on the immediately preceding Business Day, in each case with the same force and effect as if made on such date. Distributions on the Series D Preferred Shares will be made to the holders of record of the Series D Preferred Shares on the relevant record dates, which, unless otherwise provided by the Company with respect to any distribution, will be fifteen (15) Business Days prior to the relevant Preferred Shares Distribution Payment Date (each a "Distribution Record Date"). Notwithstanding anything to the contrary set forth herein, each Series D Preferred Share shall also continue to accrue all accrued and unpaid distributions up to the exchange date on any Series D Preference Unit (as such term is defined in the Second Restated and Amended Agreement of Limited Partnership of Liberty Property Limited Partnership, dated as of October 22, 1997, as amended by that certain First Amendment to Second Restated and Amended Agreement of Limited Partnership, dated as of July 28, 1999, that certain Second Amendment to Second Restated and Amended Agreement of Limited Partnership, dated as of April 18, 2000, and that certain Third Amendment to Second Restated and Amended Agreement of Limited Partnership, dated June 10, 2002 (as amended, the "Partnership Agreement")) validly exchanged into such Series D Preferred Share in accordance with the provisions of such Partnership Agreement

(ii) "Business Day" shall mean each day, other than a Saturday or a Sunday, which is not a day on which banking institutions in New York, New York are authorized or required by law, regulation or executive order to close.

(b) Limitation on Distributions. No distributions on the Series D Preferred Shares shall be declared or paid or set apart for payment by the Company at such time as the terms and provisions of any agreement of the Company, including any agreement relating to its indebtedness, prohibits such declaration, payment or setting apart for payment or provides that such declaration, payment or setting apart for payment would constitute a breach thereof or a default thereunder, or if such declaration, payment or setting apart for payment shall be restricted or prohibited by law.

(c) Distributions Cumulative. Notwithstanding the foregoing, distributions on the Series D Preferred Shares will accrue whether or not the terms and provisions set forth in Section 3(b) hereof at any time prohibit the current payment of distributions, whether or not the Company has earnings, whether or not there are funds legally available for the payment of such distributions and whether or not such distributions are authorized or declared. Accrued but unpaid distributions on the Series D Preferred Shares will accumulate as of the Preferred Shares Distribution Payment Date on which they first become payable. Accumulated and unpaid distributions will not bear interest.

(d) Priority as to Distributions.

(i) So long as any Series D Preferred Shares are outstanding, no distribution of cash or other property shall be authorized, declared, paid or set apart for payment on or with respect to any class or series of Common Shares or any class or series of other Shares of the Company ranking junior as to the payment of distributions to the Series D Preferred Shares (such Common Shares or other junior shares including, without limitation, Series A Junior Participating Preferred Shares authorized pursuant to Articles Supplementary filed with the Department on December 23, 1997, collectively, "Junior Shares"), nor shall any cash or other property be set aside for or applied to the purchase, redemption or other acquisition for consideration of any Series D Preferred Shares, any Parity Preferred Shares with respect to distributions or any Junior Shares, unless, in each case, all distributions accumulated on all Series D Preferred Shares and all classes and series of outstanding Parity Preferred Shares as to payment of distributions have been paid in full. The foregoing sentence will not prohibit (i) distributions payable solely in Junior Shares, (ii) the conversion of Junior Shares or Parity Preferred Shares into Shares of the Company ranking junior to the Series D Preferred Shares as to distributions and upon liquidation, winding-up or dissolution, and (iii) purchase by the Company of such Series D Preferred Shares, Parity Preferred Shares with respect to distributions or Junior Shares pursuant to Article VII of the Charter to the extent required to preserve the Company's status as a real estate investment trust.

(ii) So long as distributions have not been paid in full (or a sum sufficient for such full payment is not irrevocably deposited in trust for immediate payment) upon the Series D Preferred Shares and the Shares of any class or series of outstanding Parity Preferred Shares, all distributions authorized and declared on the Series D Preferred Shares and all classes or series of outstanding Parity Preferred Shares with respect to distributions shall be authorized and declared pro rata so that the amount of distributions authorized and declared per share of Series D Preferred Shares and such other classes or series of Parity Preferred Shares shall in all cases bear to each other the same ratio that accrued distributions per share on the Series D Preferred Shares and such other classes or series of Parity Preferred Shares (which shall not include any accumulation in respect of unpaid distributions for prior distribution periods if such class or series of Parity Preferred Shares do not have cumulative distribution rights) bear to each other. No interest, or sum of money in lieu of interest, shall be payable in respect of any dividend payment or payments on Series D Preferred Shares or any other Parity Preferred Shares which may be in arrears.

(e) If, for any taxable year, the Company elects to designate as "capital gain dividends" (as defined in Section 857 of the Internal Revenue Code of 1986, as amended (the "Code")) any portion (the "Capital Gains Amount") of the dividends (within the meaning of the Code) paid or made available for the year to holders of all classes of shares of beneficial interest in the Company (the "Total Dividends"), then the portion of the Capital Gains Amount that will be allocable to the holders of the Series D Preferred Units will be the Capital Gains Amount multiplied by a fraction, the numerator of which will be the total dividends (within the meaning of the Code) paid or made available to the holders of the Series D Preferred Units for the year and the denominator of which shall be the Total Dividends.

(f) No Further Rights. Holders of Series D Preferred Shares shall not be entitled to any distributions, whether payable in cash, other property or otherwise, in excess of the full cumulative distributions described herein.

SECTION 4. Liquidation Preference.

(a) Payment of Liquidating Distributions. Subject to the rights of holders of Parity Preferred Shares with respect to rights upon any voluntary or involuntary liquidation, dissolution or winding- up of the Company and subject to equity securities ranking senior to the Series D Preferred Shares with respect to rights upon any voluntary or involuntary liquidation, dissolution or winding-up of the Company, the holders of Series D Preferred Shares shall be entitled to receive out of the assets of the Company legally available for distribution or the proceeds thereof, after payment or provision for debts and other liabilities of the Company, but before any payment or distributions of the assets shall be made to holders of Common Shares or any other class or series of shares of the Company that ranks junior to the Series D Preferred Shares as to rights upon liquidation, dissolution or winding- up of the Company, an amount equal to the sum of (i) a liquidation preference of $50 per share of Series D Preferred Shares, and (ii) an amount equal to any accumulated and unpaid distributions thereon, whether or not declared, to the date of payment. In the event that, upon such voluntary or involuntary liquidation, dissolution or winding- up, there are insufficient assets to permit full payment of liquidating distributions to the holders of Series D Preferred Shares and any Parity Preferred Shares as to rights upon liquidation, dissolution or winding-up of the Company, all payments of liquidating distributions on the Series D Preferred Shares and such Parity Preferred Shares shall be made so that the payments on the Series D Preferred Shares and such Parity Preferred Shares shall in all cases bear to each other the same ratio that the respective rights of the Series D Preferred Shares and such other Parity Preferred Shares (which shall not include any accumulation in respect of unpaid distributions for prior distribution periods if such Parity Preferred Shares do not have cumulative distribution rights) upon liquidation, dissolution or winding-up of the Company bear to each other.

(b) Notice. Written notice of any such voluntary or involuntary liquidation, dissolution or winding-up of the Company, stating the payment date or dates when, and the place or places where, the amounts distributable in such circumstances shall be payable, shall be given by (i) fax and (ii) by first class mail, postage pre-paid, not less than thirty (30) and not more than sixty (60) days prior to the payment date stated therein, to each record holder of the Series D Preferred Shares at the respective addresses of such holders as the same shall appear on the share transfer records of the Company.

(c) No Further Rights. After payment of the full amount of the liquidating distributions to which they are entitled, the holders of Series D Preferred Shares will have no right or claim to any of the remaining assets of the Company.

(d) Consolidation, Merger or Certain Other Transactions. The voluntary sale, conveyance, lease, exchange or transfer (for cash, shares of stock, securities or other consideration) of all or substantially all of the property or assets of the Company to, or the consolidation or merger or other business combination of the Company with or into any corporation, trust or other entity (or of any corporation, trust or other entity with or into the Company) shall not be deemed to constitute a liquidation, dissolution or winding-up of the Company.

SECTION 5. Optional Redemption.

(a) Right of Optional Redemption. The Series D Preferred Shares may not be redeemed prior to June 10, 2007. However, in order to ensure that the Company remains a qualified real estate investment trust ("REIT") for federal income tax purposes, the Series D Preferred Shares shall be subject to the provisions of Article VII of the Charter pursuant to which Series D Preferred Shares owned by a shareholder in excess of the Ownership Limit (as such term is defined in the Charter) will automatically be exchanged for Excess Shares (as such term is defined in the Charter) and the Company will have the right to purchase Excess Shares from the holder. On or after June 10, 2007, the Company shall have the right to redeem the Series D Preferred Shares, in whole or in part, at any time or from time to time, upon not less than thirty
(30) nor more than sixty (60) days written notice, at a redemption price, payable in cash, equal to $50 per Series D Preferred Share plus accumulated and unpaid distributions, whether or not declared, to the date of redemption. If fewer than all of the outstanding Series D Preferred Shares are to be redeemed, the Series D Preferred Shares to be redeemed shall be selected pro rata (as nearly as practicable without creating fractional units).

(b) Limitation on Redemption.

(i) The redemption price of the Series D Preferred Shares (other than the portion thereof consisting of accumulated but unpaid distributions) will be payable solely out of the sale proceeds of capital stock of the Company and from no other source. For purposes of the preceding sentence, "capital stock" means any equity securities (including Common Shares and Preferred Shares), shares, participation or other ownership interests (however designated) and any rights (other than debt securities convertible into or exchangeable for equity securities) or options to purchase any of the foregoing.

(ii) The Company may not redeem fewer than all of the outstanding Series D Preferred Shares unless all accumulated and unpaid distributions have been paid in full (or a sum sufficient for such payment has been irrevocably deposited in trust for immediate payment) on all outstanding Series D Preferred Shares for all quarterly distribution periods, including the current period, terminating on or prior to the date of redemption; provided, however, that the foregoing shall not prevent the purchase by the Company of Excess Shares in order to ensure that the Company remains qualified as a REIT for federal income tax purposes or the purchase or acquisition of Series D Preferred Shares pursuant to a purchase or exchange offer made on the same terms to holders of all outstanding Series D Preferred Shares.

(c) Procedures for Redemption.

(i) Notice of redemption will be (A) faxed, and (B) mailed by the Company, postage prepaid, not less than thirty (30) nor more than sixty (60) days prior to the redemption date, addressed to the respective holders of record of the Series D Preferred Shares to be redeemed at their respective addresses as they appear on the transfer records of the Company. No failure to give or defect in such notice shall affect the validity of the proceedings for the redemption of any Series D Preferred Shares except as to the holder to whom such notice was defective or not given. In addition to any information required by law or by the applicable rules of any exchange upon which the Series D Preferred Shares may be listed or admitted to trading, each such notice shall state: (1) the redemption date; (2) the redemption price; (3) the number of Series D Preferred Shares to be redeemed; (4) the place or places where such Series D Preferred Shares are to be surrendered for payment of the redemption price; (5) that distributions on the Series D Preferred Shares to be redeemed will cease to accumulate on such redemption date and (6) that payment of the redemption price and any accumulated and unpaid distributions will be made upon presentation and surrender of such Series D Preferred Shares. If fewer than all of the Series D Preferred Shares held by any holder are to be redeemed, the notice mailed to such holder shall also specify the number of Series D Preferred Shares held by such holder to be redeemed.

(ii) If the Company gives a notice of redemption in respect of Series D Preferred Shares (which notice will be irrevocable) then, by 12:00 noon, New York City time, on the redemption date, the Company will deposit irrevocably in trust for the benefit of the Series D Preferred Shares being redeemed funds sufficient to pay the applicable redemption price, plus any accumulated and unpaid distributions, if any, on such shares to the date fixed for redemption, without interest, and will give irrevocable instructions and authority to pay such redemption price and any accumulated and unpaid distributions, whether or not declared, if any, on such shares to the holders of the Series D Preferred Shares upon surrender of the Series D Preferred Shares by such holders at the place designated in the notice of redemption. If fewer than all Series D Preferred Shares evidenced by any certificate is being redeemed, a new certificate shall be issued upon surrender of the certificate evidencing all Series D Preferred Shares, evidencing the unredeemed Series D Preferred Shares without cost to the holder thereof. On and after the date of redemption, distributions will cease to accumulate on the Series D Preferred Shares or portions thereof called for redemption, unless the Company defaults in the payment thereof. If any date fixed for redemption of Series D Preferred Shares is not a Business Day, then payment of the redemption price payable on such date will be made on the next succeeding day that is a Business Day (and without any interest or other payment in respect of any such delay) except that, if such Business Day falls in the next calendar year, such payment will be made on the immediately preceding Business Day, in each case with the same force and effect as if made on such date fixed for redemption. If payment of the redemption price or any accumulated or unpaid distributions in respect of the Series D Preferred Shares is improperly withheld or refused and not paid by the Company, distributions on such Series D Preferred Shares will continue to accumulate from the original redemption date to the date of payment, in which case the actual payment date will be considered the date fixed for redemption for purposes of calculating the applicable redemption price and any accumulated and unpaid distributions.

(d) Application of Article VII. The Series D Preferred Shares are subject to the provisions of Article VII of the Charter, including, without limitation, the provision for the redemption of Excess Shares. Notwithstanding the provisions of Article IX of the Charter, Series D Preferred Shares which have been exchanged pursuant to the Charter for Excess Shares may be redeemed, in whole or in part, at any time or from time to time, for cash at a redemption price of $50 per share, plus all accrued and unpaid distributions thereon to the date of redemption, without interest. If less than all of the outstanding Excess Shares are to be redeemed, the Excess Shares to be redeemed shall be selected pro rata (as nearly as may be practicable without creating fractional shares).

(e) Status of Redeemed Shares. Any Series D Preferred Shares that shall at any time have been redeemed shall after such redemption, have the status of authorized but unissued Preferred Shares, without designation as to class or series until such shares are once more designated as part of a particular class or series by the Board.

SECTION 6. Voting Rights.

(a) General. Holders of the Series D Preferred Shares will not have any voting rights, except as set forth below.

(b) Right to Elect Trustees.

(i) If at any time full distributions shall not have been timely made on any Series D Preferred Shares with respect to any six
(6) prior quarterly distribution periods, whether or not consecutive, (a "Preferred Distribution Default"), the holders such Series D Preferred Shares, voting together as a single class with the holders of each class or series of Parity Preferred Shares upon which like voting rights have been conferred and are exercisable, will have the right to elect two (2) additional trustees to serve on the Company's Board (the "Preferred Shares Trustees") at a special meeting called in accordance with Section 6(b)(ii) (unless such request is received less than ninety
(90) days before the date fixed for the next annual meeting) or at the next annual meeting of shareholders, and at each subsequent annual meeting of shareholders or special meeting held in place thereof, until all such distributions in arrears and distributions for the current quarterly period on the Series D Preferred Shares and each such class or series of Parity Preferred Shares have been paid in full or an amount sufficient for such payment has been irrevocably deposited in trust for immediate payment.

(ii) At any time when such voting rights shall have vested, a proper officer of the Company shall call or cause to be called, upon written request of holders of record of at least twenty percent (20%) of the outstanding Series D Preferred Shares, a special meeting of the holders of Series D Preferred Shares and all the series of Parity Preferred Shares upon which like voting rights have been conferred and are exercisable (collectively, the "Parity Securities") by mailing or causing to be mailed to such holders a notice of such special meeting to be held not less than ten (10) and not more than forty-five (45) days after the date such notice is given. The record date for determining holders of the Parity Securities entitled to notice of and to vote at such special meeting will be the close of business on the third (3rd) Business Day preceding the day on which such notice is mailed. At any such special meeting, all of the holders of the Parity Securities, by plurality vote, voting together as a single class without regard to series will be entitled to elect two directors on the basis of one vote per $50 of liquidation preference to which such Parity Securities are entitled by their terms (excluding amounts in respect of accumulated and unpaid dividends) and not cumulatively. The holder or holders of one-third of the Parity Securities then outstanding, present in person or by proxy, will constitute a quorum for the election of the Preferred Shares Trustees except as otherwise provided by law. Notice of all meetings at which holders of the Series D Preferred Shares shall be entitled to vote will be given to such holders at their addresses as they appear in the transfer records. At any such meeting or adjournment thereof in the absence of a quorum, subject to the provisions of any applicable law, a majority of the holders of the Parity Securities present in person or by proxy shall have the power to adjourn the meeting for the election of the Preferred Shares Trustees, without notice other than an announcement at the meeting, until a quorum is present. If a Preferred Distribution Default shall terminate after the notice of a special meeting has been given but before such special meeting has been held, the Company shall, as soon as practicable after such termination, mail or cause to be mailed notice of such termination to holders of the Series D Preferred Shares that would have been entitled to vote at such special meeting.

(iii) If and when all accumulated distributions and the distribution for the current distribution period on the Series D Preferred Shares shall have been paid in full or a sum sufficient for such payment is irrevocably deposited in trust for payment, the holders of the Series D Preferred Shares shall be divested of the voting rights set forth in Section 6(b) herein (subject to revesting in the event of each and every Preferred Distribution Default) and, if all distributions in arrears and the distributions for the current distribution period have been paid in full or set aside for payment in full on all other classes or series of Parity Preferred Shares upon which like voting rights have been conferred and are exercisable, the term and office of each Preferred Shares Trustees so elected shall terminate. Any Preferred Shares Trustees may be removed at any time with or without cause by the vote of, and shall not be removed otherwise than by the vote of, the holders of record of a majority of the outstanding Series D Preferred Shares when they have the voting rights set forth in Section 6(b) (voting separately as a single class with all other classes or series of Parity Preferred Shares upon which like voting rights have been conferred and are exercisable). So long as a Preferred Distribution Default shall continue, any vacancy in the office of a Preferred Shares Trustees may be filled by written consent of the Preferred Shares Trustees remaining in office, or if none remains in office, by a vote of the holders of record of a majority of the outstanding Series D Preferred Shares when they have the voting rights set forth in Section 6(b) (voting separately as a single class with all other classes or series of Parity Preferred Shares upon which like voting rights have been conferred and are exercisable). The Preferred Shares Director shall each be entitled to one vote per director on any matter.

(c) Certain Voting Rights. So long as any Series D Preferred Shares remain outstanding, the Company shall not, without the affirmative vote of the holders of at least two thirds of the Series D Preferred Shares outstanding at the time: (i) (A) designate or create, or increase the authorized or issued amount of, any class or series of shares ranking senior to the Series D Preferred Shares with respect to payment of distributions or rights upon liquidation, dissolution or winding-up, (B) reclassify any authorized shares of the Company into any such shares, or (C) create, authorize or issue any obligations or security convertible into or evidencing the right to purchase any such shares; (ii) (A) designate or create, or increase the authorized or issued amount of, any Parity Preferred Shares, (B) reclassify any authorized shares of the Company into a Parity Preferred Shares or (C) create, authorize or issue any obligations or security convertible into or evidencing the right to purchase any Parity Preferred Share; provided, however, that restrictions contained in the clause (ii) of this Paragraph (c) shall apply only to Parity Preferred Shares that are issued to an Affiliate of the Company other than on arms' length terms; or (iii) either (A) consolidate, or merge into or with, any corporation or other entity, or (B) amend, alter or repeal the provisions of the Company's Charter (including these Articles Supplementary) or Bylaws, whether by merger, consolidation or otherwise, in such a way that would materially and adversely affect the powers, special rights, preferences, privileges or voting power of the Series D Preferred Shares or the holders thereof; provided, however, that with respect to the occurrence of a merger or consolidation, so long as (1) the Company is the surviving entity and the Series D Preferred Shares remain outstanding with the terms thereof unchanged, or (2) the resulting, surviving or transferee entity is a corporation organized under the laws of any state and substitutes for the Series D Preferred Shares other Preferred Shares having substantially the same terms and same rights as the Series D Preferred Shares, including with respect to distributions, voting rights and rights upon liquidation, dissolution or winding-up, then the occurrence of any such event shall not be deemed materially and adversely affect the rights, privileges or voting powers of the holders of the Series D Preferred Shares; provided, further, that any increase in the amount of authorized Preferred Shares or the creation or issuance of any other class or series of Preferred Shares or any increase in an amount of authorized shares of each class or series, shall not be deemed to materially and adversely affect the rights, preferences, privileges or voting powers of the Series D Preferred Shares, if such Series D Preferred Shares rank (y) junior to the Series D Preferred Shares with respect to payment of distributions or the distribution of assets upon liquidation, dissolution or winding- up, or (z) on a parity with the Series D Preferred Shares with respect to payment of distributions or the distribution of assets upon liquidation, dissolution or winding-up; provided, that any Series D Preferred Shares issued in reliance on the preceding clause (z) shall not have been issued to an Affiliate of the Company or are issued to such Affiliate on arms' length terms. In the event of any conflict or inconsistency between this Section 6 and Sections 8.2, 10.1 and 10.3 of the Charter, this Section 6 shall control.

SECTION 7. Transfer Restrictions. The Series D Preferred Shares shall be subject to the provisions of Article VII of the Charter.

SECTION 8. No Conversion Rights. The holders of the Series D Preferred Shares shall not have any rights to convert such shares into shares of any other class or series of shares or into any other securities of, or interest in, the Company except that the Series D Preferred Shares may be exchanged by the Company for Excess Shares, in accordance with the Charter.

SECTION 9. No Sinking Fund. No sinking fund shall be established for the retirement or redemption of Series D Preferred Shares.

SECTION 10. No Preemptive Rights. No holder of the Series D Preferred Shares of the Company shall, as such holder, have any preemptive rights to purchase or subscribe for additional Shares of the Company or any other security of the Company which the Company may issue or sell.

SECOND: The Series D Preferred Shares have been classified and designated by the Board under the authority contained in the Charter.

THIRD: These Articles Supplementary have been approved by the Board in the manner and by the vote required by law.

FOURTH: These Articles Supplementary shall be effective at the time the State Department of Assessments and Taxation of Maryland accepts these Articles Supplementary for record.

FIFTH: The undersigned Chairman of the Board and Chief Executive Officer of the Company acknowledges these Articles Supplementary to be the corporate act of the Company and, as to all matters or facts required to be verified under oath, the undersigned Chairman of the Board and Chief Executive Officer acknowledges that to the best of his knowledge, information and belief, these matters and facts are true in all material respects and that this statement is made under the penalties for perjury.

In Witness Whereof, the Company has caused these Articles Supplementary to be executed under seal in its name and on its behalf by its Chairman and Chief Executive Officer and attested to by its Secretary as of June 10, 2002.

[SEAL}
ATTEST:                           LIBERTY PROPERTY TRUST


                                  By:
----------------------------      -------------------------------
JAMES J. BOWES                       WILLARD G. ROUSE, III.
Secretary                            Chairman and Chief Executive
Officer

EXHIBIT 3.1.2

THIRD AMENDMENT

TO

SECOND RESTATED AND AMENDED

AGREEMENT OF LIMITED PARTNERSHIP

OF

LIBERTY PROPERTY LIMITED PARTNERSHIP

THIS THIRD AMENDMENT TO THE SECOND RESTATED AND AMENDED AGREEEMTN OF LIMITED PARTNERSHIP, dated as of June 10, 2002 (this "Amendment"), is entered into by LIBERTY PROPERTY TRUST, a Maryland real estate investment trust, as general partner (the "General Partner") of LIBERTY PROPERTY LIMITED PARTNERSHIP, a Pennsylvania limited partnership (the "Partnership"), for itself and on behalf of the limited partners of the Partnership, and JPM MOSAIC VI REIT, INC., a Maryland corporation ("Mosaic VI REIT").

WHEREAS, Section 4.2(a) of the Second Restated and Amended Agreement of Limited Partnership of the Partnership, as amended by that certain First Amendment to the Second Restated and Amended Agreement of Limited Partnership, dated as of July 28, 1999, and that certain Second Amendment to the Second Restated and Amended Agreement of Limited Partnership, dated April 18, 2000 (collectively, as amended, the "Partnership Agreement"), authorizes the General Partner to cause the Partnership to issue additional Partnership Units in one or more classes or series, with such designations, preferences and relative, participating, optional or other special rights, powers and duties as shall be determined by the General Partner, subject to the provisions of such section; and

WHEREAS, pursuant to the authority granted to the General Partner pursuant to Sections 4.2(a) and 14.1(b) of the Partnership Agreement, the General Partner desires to amend the Partnership Agreement (i) to establish a new class of Partnership Units, the "Series D Preferred Units" (as hereinafter defined), and to set forth the designations, rights, powers, preferences and duties of such Series D Preferred Units, (ii) to issue the Series D Preferred Units to Mosaic VI REIT and admit Mosaic VI REIT as an Additional Limited Partner and (iii) to make certain other changes to the Partnership Agreement.

NOW, THEREFORE, in consideration of good and valuable consideration, the receipt and sufficiency of which hereby are acknowledged, the General Partner hereby amends the Partnership Agreement as follows:
Definitions.

SECTION 1. DEFINITION. For poses of this Amendment, the term "Parity Preferred Units" shall be used to refer to any class or series of Partnership Interests of the Partnership now or hereafter authorized, issued or outstanding expressly designated by the Partnership to rank on a parity with Series D Preferred Units with respect to distributions and rights upon voluntary or involuntary liquidation, winding-up or dissolution of the Partnership including, without limitation, the "8.80% Series A Cumulative Redeemable Preferred Partnership Interests," the "9.25% Series B Cumulative Redeemable Preferred Partnership Interests," and the "9.125% Series C Cumulative Redeemable Preferred Partnership Interests." The term "Priority Return" shall mean, an amount equal to 7.625% per annum, as the same may be adjusted pursuant to Section 3(a) below, determined on the basis of a 360 day year of twelve (12) 30-day months (and for any period shorter than a full quarterly period for which distributions are computed, the amount of the distribution payable will be computed based on the ratio of the actual number of days elapsed in such period to ninety (90) days), cumulative to the extent not distributed for any given distribution period pursuant to Section 6.2 of the Partnership Agreement, of the stated value of $50 per Series D Preferred Unit, commencing on the date of issuance of such Series D Preferred Unit. The term "Subsidiary" shall mean with respect to any person, any corporation, partnership, limited liability company, joint venture or other entity of which a majority of (i) voting power of the voting equity securities or (ii) the outstanding equity interests, is owned, directly or indirectly, by such person. The term "PTP" shall mean a "publicly traded partnership" within the meaning of Section 7704 of the Internal Revenue Code (the "Code"). Capitalized terms used herein and not otherwise defined herein shall have the meanings ascribed to them in the Partnership Agreement.

SECTION 2. DESIGNATION AND NUMBER. A series of Partnership Interests in the Partnership designated as the "7.625% Series D Cumulative Redeemable Preferred Partnership Interests" (the "Series D Preferred Units") is hereby established. The maximum number of Series D Preferred Units shall be 473,000.

SECTION 3.
(a) Payment of Distributions. Subject to the rights of holders of Parity Preferred Units and holders of Partnership Interests ranking senior to the Series D Preferred Units as to payment of distributions, pursuant to Section 6.2 of the Partnership Agreement, holders of Series D Preferred Units will be entitled to receive, when, as and if declared by the Partnership acting through the General Partner, out of Net Operating Cash Flow, cumulative preferential cash distributions at the rate per annum of 7.625% of the original Capital Contribution per Series D Preferred Unit (the "Issuance Rate"). All distributions shall be cumulative, shall accrue from the original date of issuance and will be payable (i) quarterly in arrears, on or before March 31, June 30, September 30 and December 31 of each year commencing on the first such date to occur after the original date of issuance, and, (ii), in the event of (A) an exchange of Series D Preferred Units into Series D Preferred Shares, or (B) a redemption of Series D Preferred Units, on the exchange date or redemption date, as applicable (each a "Preferred Unit Distribution Payment Date"). The amount of the distribution payable for any period will be computed on the basis of a 360-day year of twelve (12) 30-day months and for any period shorter than a full quarterly period for which distributions are computed, the amount of the distribution payable will be computed based on the ratio of the actual number of days elapsed in such period to ninety (90) days. If any date on which distributions are to be made on the Series D Preferred Units is not a Business Day (as such term is defined herein), then payment of the distribution to be made on such date will be made on the next succeeding day that is a Business Day (and without any interest or other payment in respect of any such delay) except that, if such Business Day is in the next succeeding calendar year, such payment shall be made on the immediately preceding Business Day, in each case with the same force and effect as if made on such date. Distributions on the Series D Preferred Units will be made to the holders of record of the Series D Preferred Units on the relevant record dates to be fixed by the Partnership acting through the General Partner, which record dates shall in no event exceed fifteen (15) Business Days prior to the relevant Preferred Unit Distribution Payment Date (the "Preferred Unit Partnership Record Date").

(b) Distributions Cumulative. Distributions on the Series D Preferred Units will accrue whether or not the terms and provisions of any agreement of the Partnership, including any agreement relating to its indebtedness at any time prohibit the declaration, setting aside for payment or current payment of distributions, whether or not the Partnership has earnings, whether or not there are funds legally available for the payment of such distributions and whether or not such distributions are authorized. Accrued but unpaid distributions on the Series D Preferred Units will accumulate as of the Preferred Unit Distribution Payment Date on which they first become payable. Distributions on account of arrears for any past distribution periods may be declared and paid at any time, without reference to a regular Preferred Unit Distribution Payment Date to holders of record of the Series D Preferred Units on the record date fixed by the Partnership acting through the General Partner, which date shall not exceed fifteen
(15) Business Days prior to the payment date. Accumulated and unpaid distributions will not bear interest.

(c) Priority as to Distributions.

(i) So long as any Series D Preferred Units are outstanding, no distribution of cash or other property shall be authorized, declared, paid or set apart for payment on or with respect to any class or series of Partnership Interest of the Partnership ranking junior as to the payment of distributions or rights upon a voluntary or involuntary liquidation, dissolution or winding-up of the Partnership to the Series D Preferred Units (collectively, "Junior Units"), nor shall any cash or other property be set aside for or applied to the purchase, redemption or other acquisition for consideration of any Series D Preferred Units, any Parity Preferred Units or any Junior Units, unless, in each case, all distributions accumulated on all Series D Preferred Units and all classes and series of outstanding Parity Preferred Units have been paid in full or a sum sufficient for such full payment has been irrevocably deposited in trust for immediate payment. The foregoing sentence will not prohibit
(a) distributions payable solely in Junior Units, (b) the conversion of Junior Units or Parity Preferred Units into Partnership Interests of the Partnership ranking junior to the Series D Preferred Units as to distributions and rights upon the voluntary or involuntary liquidation, dissolution or winding up of the Partnership, (c) the redemption of Partnership Interests corresponding to any Series D Preferred Shares, Parity Preferred Shares with respect to distributions or Junior Shares to be purchased by the General Partner pursuant to Article VII of the Amended and Restated Declaration of Trust of the General Partner (as amended and modified through the date hereof, the "Charter") to preserve the General Partner's status as a real estate investment trust, provided that such redemption shall be upon the same terms as the corresponding purchase pursuant to Article VII of the Charter or
(d) the foreclosure by the Partnership on the Partnership Interests constituting the Indemnity Collateral and/or the Special Indemnity Collateral (as such term is defined in Section 13.3 of the Partnership Agreement).

(ii) So long as distributions have not been paid in full (or a sum sufficient for such full payment is not irrevocably deposited in trust for immediate payment) upon the Series D Preferred Units, all distributions authorized and declared on the Series D Preferred Units and all classes or series of outstanding Parity Preferred Units shall be authorized and declared so that the amount of distributions authorized and declared per Series D Preferred Unit and such other classes or series of Parity Preferred Units shall in all cases bear to each other the same ratio that accrued distributions per Series D Preferred Unit and such other classes or series of Parity Preferred Units (which shall not include any accumulation in respect of unpaid distributions for prior distribution periods if such class or series of Parity Preferred Units do not have cumulative distribution rights) bear to each other. No interest or any sum of money in lieu of interest shall be payable in respect of any distribution, payment or payments on Series D Preferred Units which may be in arrears.

(d) No Further Rights. Holders of Series D Preferred Units shall not be entitled to any distributions, whether payable in cash, other property or otherwise, in excess of the full cumulative distributions described herein.

SECTION 4. Allocations. Section 1 of Exhibit C to the Partnership Agreement is hereby deleted and replaced by the following:

(a) Net Income. Except as otherwise provided herein, Net Income for any fiscal year or other applicable period shall be allocated in the following order and priority:

(i) first, to the General Partner to the extent of Net Loss previously allocated to the General Partner pursuant to Section 1(b)(iii) below for all prior fiscal years or other applicable periods exceed Net Income previously allocated to the General Partner pursuant to this Section 1(a)(i) for all prior fiscal years or other applicable periods;

(ii) second, to Partners holding any Partnership Interests that are entitled to any preference in distribution to the extent that Net Loss previously allocated to such holders pursuant to Section l(b)(ii) below for all prior fiscal years or other applicable periods exceeds Net Income previously allocated to such Partners pursuant to this Section 1(a)(ii) for all prior fiscal years or other applicable periods;

(iii) third, to Partners holding Partnership Interests of a class not entitled to preference in distribution to the extent that Net Loss previously allocated to such holders pursuant to Section 1(b)(i) below for all prior fiscal years or other applicable periods exceeds Net Income previously allocated to such holders pursuant to this
Section 1(a)(iii) for all prior fiscal years or other applicable periods;

(iv) fourth, to Partners holding any Partnership Interests that are entitled to any preference in distribution in accordance with the rights of any such class of Partnership Interests until each such Partnership Interest has been allocated, Net Income equal to the excess of (A) the cumulative amount of preferred distributions such Partners are entitled to receive to the last day of the current fiscal year or other applicable period or to the date of redemption, to the extent such Partnership Interests are redeemed during such period, over (B) the cumulative Net Income allocated to such Partners, pursuant to this
Section 1(a)(iv) for all prior fiscal years or other applicable periods (and, within each such class, pro rata in proportion to the respective share of such Partnership Interests each Partner holds as of the last day of the period for which such allocation is being made); and

(v) fifth, with respect to Partnership Interests that are not entitled to any preference in the allocation of Net Income, pro rata to each such class in accordance with the terms of such class (and, within each such class, pro rata in proportion to each Partner's respective share of such Partnership Interests as of the last day of the period for which such allocation is being made).

(b) Net Loss. Except as otherwise provided herein, Net Loss for any fiscal year or other applicable period shall be allocated in the following order and priority:

(i) first, with respect to classes of Partnership Interests that are not entitled to any preference in distribution (including the General Partner Interest), pro rata to each such class in accordance with the terms of such class (and, within such class, pro rata in proportion to each Partner's respective share of such Partnership Interests as of the last day of the period for which such allocation is being made) until the Adjusted Capital Account (ignoring for this purpose any amounts a Partner is obligated to contribute to the capital of the Partnership or is deemed obligated to contribute pursuant to Regulations Section 1.704-1(b)(2)(ii)(c)(2)) of each Partner with respect to such Partnership Interests is reduced to zero;

(ii) second, to the Partners holding any Partnership Interests that are entitled to any preference in distribution in accordance with the rights of any such class of Partnership Interests (and, if there is more than one class of such Partnership Interests, then in the reverse order of their preference in distribution), until the Adjusted Capital Account (modified in the same manner as in clause
(i)) of each such Partner with respect to such Partnership Interests is reduced to zero; and

(iii) third, to the General Partner.

To the extent permitted under Section 704 of the Code, solely for purposes of allocating Net Income or Net Loss in any taxable year (or a portion thereof) to Partners holding Series B Preferred Units, Series C Preferred Units or Series D Preferred Units pursuant to Section 1 hereof, items of Net Income or Net Loss, as the case may be, shall not include Depreciation with respect to properties that are "ceiling limited" in respect of holders of Series B Preferred Units, Series C Preferred Units or Series D Preferred Units. For purposes of the preceding sentence, Partnership property shall be considered "ceiling limited" in respect of a holder of Series B Preferred Units, Series C Preferred Units or Series D Preferred Units if Depreciation attributable to such Partnership property which would otherwise be allocable to such Partner, without regard to this paragraph, exceeds depreciation determined for federal income tax purposes attributable to such Partnership property which would otherwise be allocable to such holder by more than 5%. Notwithstanding the foregoing sentences in this paragraph, in applying this paragraph, the General Partner may, in its discretion for administrative ease and convenience, calculate Net Income or Net Loss in any taxable year (or a portion thereof) allocable to the Partners holding Series B Preferred Units, Series C Preferred Units or Series D Preferred Units by excluding Depreciation with respect to all properties of the Partnership. The parties intend hereunder that the aggregate Capital Account balance of the holders of Series B Preferred Units, Series C Preferred Units or Series D Preferred Units at any date shall not exceed the amount of the original Capital Contribution of such holder plus the cumulative Priority Return, whether or not declared, to the extent not previously distributed.

SECTION 5. Liquidation Proceeds.

(a) Upon any voluntary or involuntary liquidation, dissolution or winding-up of the affairs of the Partnership, distributions on the Series D Preferred Units shall be made in accordance with Section 8.2 of the Partnership Agreement.

(b) Notice. Written notice of any such voluntary or involuntary liquidation, dissolution or winding-up of the Partnership, stating the payment date or dates when, and the place or places where, the amounts distributable in such circumstances shall be payable, shall be given by (i) fax and (ii) by first class mail, postage prepaid, not less than twenty (20) and not more than sixty (60) days prior to the payment date stated therein, to each record holder of the Series D Preferred Units at the respective addresses of such holders as the same shall appear on the transfer records of the Partnership.

(c) No Further Rights. After payment of the full amount of the liquidating distributions to which they are entitled, the holders of Series D Preferred Units will have no right or claim to any of the remaining assets of the Partnership.

(d) Consolidation, Merger or Certain Other Transactions. The consolidation or merger of the Partnership with or into any other corporation, trust, partnership, limited liability company or other entity (or of any other corporation, trust, partnership, limited liability company or other entity with or into the Partnership), or the sale, lease, exchange, transfer or conveyance of all or substantially all of the property or business of the Partnership shall not be deemed to constitute a liquidation, dissolution or winding-up of the Partnership.

SECTION 6. Optional Redemption.

(a) Right of Optional Redemption. The Series D Preferred Units may not be redeemed prior to the fifth (5th) anniversary of the issuance date. On or after such date, the Partnership at its sole option shall have the right to redeem the Series D Preferred Units, in whole or in part, at any time or from time to time, upon not less than thirty (30) nor more than sixty (60) days written notice, at a redemption price, payable in cash, equal to the Capital Account balance of the holders of Series D Preferred Units (the "Series D Redemption Price"); provided, however, that no redemption pursuant to this Section 6 will be permitted if the Redemption Price does not equal or exceed the original Capital Contribution of such holder plus the cumulative Priority Return, whether or not declared, to the redemption date to the extent not previously distributed. If fewer than all of the outstanding Series D Preferred Units are to be redeemed, the Series D Preferred Units to be redeemed shall be selected pro rata (as nearly as practicable without creating fractional units).

(b) Limitation on Redemption.

(i) The Redemption Price of the Series D Preferred Units (other than the portion thereof consisting of accumulated but unpaid distributions) will be payable solely out of the sale proceeds of capital stock of the General Partner, which will be contributed by the General Partner to the Partnership as additional capital contribution, or out of the sale of limited partner interests in the Partnership and from no other source. For purposes of the preceding sentence, "capital stock" means any equity securities (including Common Shares and Preferred Shares (as such terms are defined in the Charter)), shares, participation or other ownership interests (however designated) and any rights (other than debt securities convertible into or exchangeable for equity securities) or options to purchase any of the foregoing.

(ii) The Partnership may not redeem fewer than all of the outstanding Series D Preferred Units unless all accumulated and unpaid distributions have been paid or contemporaneously are authorized and paid (or authorized and a sum sufficient for the full payment thereof is irrevocably deposited in trust for immediate payment) on all Series D Preferred Units for all quarterly distribution periods terminating on or prior to the date of redemption.

(c) Procedures for Redemption.

(i) Notice of redemption will be (A) faxed, and (B) mailed by the Partnership, by certified mail, postage prepaid, not less than thirty (30) nor more than sixty (60) days prior to the redemption date, addressed to the respective holders of record of the Series D Preferred Units at their respective addresses as they appear on the records of the Partnership. No failure to give or defect in such notice or in the transmission thereof shall affect the validity of the proceedings for the redemption of any Series D Preferred Units except as to the holder to whom such notice was defective or not given or received. In addition to any information required by law, each such notice shall state: (1) the redemption date; (2) the Redemption Price;
(3) the aggregate number of Series D Preferred Units to be redeemed and if fewer than all of the outstanding Series D Preferred Units are to be redeemed, the number of Series D Preferred Units to be redeemed held by such holder, which number shall equal such holder's pro rata share (based on the percentage of the aggregate number of outstanding Series D Preferred Units the total number of Series D Preferred Units held by such holder represents) of the aggregate number of Series D Preferred Units to be redeemed; (4) the place or places where the Series D Preferred Units are to be surrendered for payment of the Redemption Price; (5) that distributions on the Series D Preferred Units to be redeemed will cease to accumulate on such redemption date; and (6) that payment of the Redemption Price will be made upon presentation and surrender of such Series D Preferred Units.

(ii) If the Partnership gives a notice of redemption in respect of Series D Preferred Units (which notice will be irrevocable) then, by 12:00 noon, New York City time, on the redemption date, the Partnership will deposit irrevocably in trust for the benefit of the Series D Preferred Units being redeemed funds sufficient to pay the applicable Redemption Price and will give irrevocable instructions and authority to pay such Redemption Price to the holders of the Series D Preferred Units upon surrender of the Series D Preferred Units by such holders at the place designated in the notice of redemption. If the Series D Preferred Units are evidenced by a certificate and if fewer than all Series D Preferred Units evidenced by any certificate are being redeemed, a new certificate shall be issued, upon surrender of the certificate evidencing all Series D Preferred Units, evidencing the unredeemed Series D Preferred Units without cost to the holder thereof. On and after the date of such redemption, distributions will cease to accumulate on the Series D Preferred Units or portions thereof called for redemption, unless the Partnership defaults in the payment thereof. If any date fixed for redemption of Series D Preferred Units is not a Business Day, then payment of the Redemption Price payable on such date will be made on the next succeeding day that is a Business Day (and without any interest or other payment in respect of any such delay) except that, if such Business Day falls in the next calendar year, such payment will be made on the immediately preceding Business Day, in each case with the same force and effect as if made on such date fixed for redemption. If payment of the Redemption Price is improperly withheld or refused and not paid by the Partnership, distributions on such Series D Preferred Units will continue to accumulate from the original redemption date to the date of payment, in which case the actual payment date will be considered the date fixed for redemption for purposes of calculating the applicable Redemption Price.

SECTION 7. Voting Rights.

(a) General. Holders of the Series D Preferred Units will not have any voting rights or right to consent to any matter requiring the consent or approval of the Limited Partners, except as set forth below.

(b) Certain Voting Rights. So long as any Series D Preferred Units remain outstanding, the Partnership shall not, without the affirmative vote of the holders of at least two-thirds of the Series D Preferred Units outstanding at the time (i) (A) authorize or create, or increase the authorized or issued amount of, any class or series of Partnership Interests senior to the Series D Preferred Units with respect to payment of distributions or rights upon liquidation, dissolution or winding-up, (B) reclassify any Partnership Interests of the Partnership into any such senior Partnership Interest, or (C) create, authorize or issue any obligations or security convertible into or evidencing the right to purchase any such senior Partnership Interests, (ii) (A) authorize or create, or increase the authorized or issued amount of any Parity Preferred Units, (B) reclassify any Partnership Interest into a Parity Preferred Unit, or (C) create, authorize or issue any obligations or security convertible into or evidencing the right to purchase any Parity Preferred Unit; provided, however, that restrictions contained in this clause (ii) of this paragraph (b) shall apply only to Parity Preferred Units that are issued to an Affiliate of the Partnership other than on arms' length terms, and to no other issuance, including, without limitation, an issuance to the General Partner, the purpose of which is to allow the General Partner to issue corresponding preferred Shares to persons who are not Affiliates or the Partnership, or (iii) either (A) consolidate or merge into or with any corporation or other entity or (B) amend, alter or repeal the provisions of the Partnership Agreement, whether by merger or consolidation or otherwise, in such a way that would materially and adversely affect the powers, special rights, preferences, privileges or voting power of the Series D Preferred Units or the holders thereof; provided, however, that with respect to the occurrence of a merger or consolidation, so long as (1) the Partnership is the surviving entity and the Series D Preferred Units remain outstanding with the terms thereof unchanged, or (2) the resulting, surviving or transferee entity is a partnership, limited liability company or other pass-through entity organized under the laws of any state, and such entity substitutes for the Series D Preferred Units other interests in such entity having substantially the same terms and rights as the Series D Preferred Units, including with respect to distributions, voting rights and rights upon liquidation, dissolution or winding-up, then the occurrence of any such event shall not be deemed to materially and adversely affect the rights, privileges or voting powers of the holders of the Series D Preferred Units; provided, further, that any increase in the amount of Partnership Interests or the creation or issuance of any other class or series of Partnership Interests, shall not be deemed to materially and adversely affect the rights, preferences, privileges or voting powers of the Series D Preferred Units, if such Partnership Units rank (y) junior to the Series D Preferred Units with respect to payment of distributions or the distribution of assets upon liquidation, dissolution or winding up, or (z) on a parity with the Series D Preferred Units with respect to payment of distributions or the distribution of assets upon liquidation, dissolution or winding-up; provided, however, that any Preferred Units issued in reliance on the preceding clause (z) shall have been issued to an Affiliate of the Partnership on arms' length terms, or to the General Partner in order to allow the General Partner to issue corresponding preferred Shares to persons who are not Affiliates of the Partnership. In the event of any conflict or inconsistency between this Section 8 and Article XIV of the Partnership Agreement, this Section 8 shall control.

SECTION 8. Transfer Restrictions. The Series D Preferred Units shall be subject to the provisions of Article IX of the Partnership Agreement; provided, however, that (a) the General Partner shall act reasonably in exercising its discretion pursuant to the provisions of Sections 9.2(a) and 9.2(c) of the Partnership Agreement and shall not withhold its consent to any transfer to any Person, and the admission of such Person as a Substituted Limited Partner, which Person does not violate the requirements of Section 9.3 of the Partnership Agreement and such transfers do not cause the total number of holders of Series D Preferred Units which would be considered partners under Treasury Regulation Section 1.7704-1(h)(3), at any time the Partnership is satisfying the private placement safe harbor of Treasury Regulation
Section 1.7704-1(h) to exceed the lesser of (i) (A) four (4) through December 31, 2002 and (B) six (6) after December 31, 2002 and (ii) the maximum number that would permit the Partnership to continue to satisfy such safe harbor (but in assessing the status of such safe harbor, (i) substituting "90" for "100"; and (2) taking into account any number of partners that the General Partner reasonably anticipates becoming partners within the meaning of the Treasury Regulations Section 1.7704- 1(h)(3) within six months of the date of such transfer by the Series D Preferred Unit holders) and (b) the term "transfer" when used in Article IX shall not be deemed to include any exchange pursuant to
Section 9 below.

SECTION 9. Exchange Rights.

(a) Right to Exchange.

(i) Series D Preferred Units will be exchangeable in whole or in part at anytime on or after the tenth (10th) anniversary of the date of issuance, at the option of the holders thereof, for authorized but previously unissued shares of 7.625% Series D Cumulative Redeemable Preferred Shares of the General Partner (the "Series D Preferred Shares") at an exchange rate of one Series D Preferred Share for one Series D Preferred Unit, subject to adjustment as described below (the "Exchange Price"), provided that the Series D Preferred Units will become exchangeable at any time, in whole or in part, at the option of the holders of Series D Preferred Units for Series D Preferred Shares if (x) at any time full distributions shall not have been timely made on any Series D Preferred Unit with respect to six (6) prior quarterly distribution periods, whether or not consecutive, provided, however, that a distribution in respect of Series D Preferred Units shall be considered timely made if made within two (2) Business Days after the applicable Preferred Unit Distribution Payment Date if at the time of such late payment there shall not be any prior quarterly distribution periods in respect of which full distributions were not timely made or
(y) upon receipt by a holder or holders of Series D Preferred Units of
(1) notice from the General Partner that the General Partner or a Subsidiary of the General Partner has taken the position that the Partnership is, or upon the occurrence of a defined event in the immediate future will be, a PTP and (2) an opinion rendered by an outside nationally recognized independent counsel familiar with such matters addressed to a holder or holders of Series D Preferred Units that the Partnership is or likely is, or upon the occurrence of a defined event in the immediate future will be or likely will be, a PTP. In addition, the Series D Preferred Units may be exchanged for Series D Preferred Shares, in whole or in part, at the option of any holder prior to the tenth (10th) anniversary of the issuance date and after the third (3rd) anniversary thereof if such holder of a Series D Preferred Units shall deliver to the General Partner either (i) a private letter ruling addressed to such holder of Series D Preferred Units or (ii) an opinion of independent counsel reasonably acceptable to the General Partner based on the enactment of temporary or final Treasury Regulations or the publication of a Revenue Ruling, in either case to the effect that an exchange of the Series D Preferred Units at such earlier time would not cause the Series D Preferred Units to be considered "stock and securities" within the meaning of section 351(e) of the Code for purposes of determining whether the holder of such Series D Preferred Units is an "investment company" under section 721(b) of the Code if an exchange were to occur at such time. Furthermore, the Series D Preferred Units may be exchanged in whole but not in part by any holder thereof which is a real estate investment trust within the meaning of Sections 856 through 859 of the Code for Series D Preferred Shares (but only if the exchange in whole may be accomplished consistently with the ownership limitations set forth under Article VII of the Charter (taking into account exceptions thereto and exemptions therefrom)) if at any time, (i) the Partnership reasonably determines that the assets and income of the Partnership for a taxable year after 2002 would not satisfy the income and assets tests of Section 856 of the Code for such taxable year if the Partnership were a real estate investment trust within the meaning of the Code or
(ii) any such holder of Series D Preferred Units shall deliver to the Partnership and the General Partner an opinion of independent counsel reasonably acceptable to the General Partner to the effect that, based on the assets and income of the Partnership for a taxable year after 2002, the Partnership would not satisfy the income and assets tests of
Section 856 of the Code for such taxable year if the Partnership were a real estate investment trust within the meaning of the Code and that such failure would create a meaningful risk that a holder of the Series D Preferred Units would fail to maintain qualification as a real estate investment trust.

(ii) Notwithstanding anything to the contrary set forth in
Section 9(a)(i) hereof, if an Exchange Notice (as such term is defined herein) has been delivered to the General Partner, then the General Partner may, at its option, elect to redeem or cause the Partnership to redeem all or a portion of the outstanding Series D Preferred Units for cash in an amount equal to the original Capital Contribution per Series D Preferred Unit plus all accrued and unpaid distributions thereon to the date of redemption. The General Partner may exercise its option to redeem the Series D Preferred Units for cash pursuant to this Section 9(a)(ii) hereof by giving each holder of record of Series D Preferred Units notice of its election to redeem for cash, within ten (10) Business Days after receipt of the Exchange Notice, by (1) fax, and (2) registered mail, postage paid, at the address of each holder as it may appear on the records of the Partnership stating (A) the redemption date, which shall be no later than sixty (60) days following the receipt of the Exchange Notice, (B) the redemption price, (C) the place or places where the Series D Preferred Units are to be surrendered for payment of the redemption price, (D) that distributions on the Series D Preferred Units will cease to accrue on such redemption date, (E) that payment of the redemption price will be made upon presentation and surrender of the Series D Preferred Units and (F) the aggregate number of Series D Preferred Units to be redeemed, and if fewer than all of the outstanding Series D Preferred Units are to be redeemed, the number of Series D Preferred Units to be redeemed held by such holder, which number shall equal such holder's pro rata share (based on the percentage of the aggregate number of outstanding Series D Preferred Units the total number of Series D Preferred Units held by such holder represents) of the aggregate number of Series D Preferred Units being redeemed.

(iii) In the event an exchange of all or a portion of Series D Preferred Units pursuant to Section 9(a)(i) hereof would violate the provisions on ownership limitation of the General Partner set forth in Article VII of the Charter with respect to the Series D Preferred Shares, the General Partner shall give written notice thereof to each holder of record of Series D Preferred Units, within five (5) Business Days following receipt of the Exchange Notice, by (1) fax, and
(2) registered mail, postage prepaid, at the address of each such holder set forth in the records of the Partnership. In such event, each holder of Series D Preferred Units shall be entitled to exchange, pursuant to the provision of Section 9(b) a number of Series D Preferred Units which would comply with the provisions on the ownership limitation of the General Partner set forth in Article VII of the Charter and any Series D Preferred Units not so exchanged (the "Excess Units") shall be redeemed by the Partnership for cash in an amount equal to the original Capital Contribution per Excess Unit, plus any accrued and unpaid distributions thereon, whether or not declared, to the date of redemption. The written notice of the General Partner shall state (A) the number of Excess Units held by such holder, (B) the redemption price of the Excess Units, (C) the date on which such Excess Units shall be redeemed, which date shall be no later than sixty (60) days following the receipt of the Exchange Notice, (D) the place or places where such Excess Units are to be surrendered for payment of the Redemption Price, (E) that distributions on the Excess Units will cease to accrue on such redemption date and (F) that payment of the redemption price will be made upon presentation and surrender of such Excess Units. In the event an exchange would result in Excess Units, as a condition to such exchange, each holder of such Excess Units agrees to provide representations and covenants reasonably requested by the General Partner relating to: (x) the widely held nature of the interests in such holder, sufficient to assure the General Partner that the holder's ownership of shares of beneficial interest of the General Partner (without regard to the limits described above) will not cause any individual to Beneficially Own in excess of the Ownership Limit (all as such term is defined in the Charter); and (y) to the extent such holder can so represent and covenant without obtaining information from its owners, the holder's ownership of tenants of the Partnership and its affiliates.

(iv) The redemption of Series D Preferred Units described in Sections 9(a)(ii) and (iii) hereof shall be subject to the provisions of Section 6(b)(i) hereof; provided, however, that the term "Redemption Price" in such Section shall be read to mean the original Capital Contribution per Series D Preferred Unit being redeemed plus all accrued and unpaid distributions to the redemption date.

(b) Procedure for Exchange.

(i) Any exchange shall be exercised pursuant to a notice of exchange (the "Exchange Notice") delivered to the General Partner by the holder who is exercising such exchange right, by (A) fax and (B) by certified mail postage prepaid. The exchange of Series D Preferred Units, or a specified portion thereof, may be effected after the fifth
(5th) Business Day following receipt by the General Partner of the Exchange Notice by delivering certificates, if any, representing such Series D Preferred Units to be exchanged together with, if applicable, written notice of exchange and a proper assignment of such Series D Preferred Units to the office of the General Partner maintained for such purpose. Currently, such office is:

65 Valley Stream Parkway Malvern, Pennsylvania 19355

Each exchange will be deemed to have been effected immediately prior to the close of business on the date on which such Series D Preferred Units to be exchanged (together with all required documentation) shall have been surrendered and notice shall have been received by the General Partner as aforesaid and the Exchange Price shall have been paid. Any Series D Preferred Shares issued pursuant to this Section 10 shall be delivered as shares which are duly authorized, validly issued, fully paid and nonassessable, free of pledge, lien, encumbrance or restriction other than those provided in the Charter, the Bylaws of the General Partner, the Securities Act and relevant state securities or blue sky laws.

(ii) If the event of an exchange of Series D Preferred Units for shares of Series D Preferred Shares, an amount equal to the accrued and unpaid distributions, whether or not declared, to the date of exchange on any Series D Preferred Units tendered for exchange shall (A) accrue on the Series D Preferred Shares into which such Series D Preferred Units are exchanged, and (B) continue to accrue on such Series D Preferred Units, which shall remain outstanding following such exchange, with the General Partner as the holder of such Series D Preferred Units. Notwithstanding anything to the contrary set forth herein, in no event shall a holder of a Series D Preferred Unit that was validly exchanged into Series D Preferred Shares pursuant to this
Section 9 (other than the General Partner now holding such Series D Preferred Unit), receive a cash distribution out of Available Cash of the Partnership, if such holder, after exchange, is entitled to receive a distribution out of Available Cash with respect to the Series D Preferred Shares for which such Series D Preferred Unit was exchanged or redeemed.

(iii) Fractional shares of Series D Preferred Shares are not to be issued upon exchange but, in lieu thereof, the General Partner will pay a cash adjustment based upon the fair market value of the Series D Preferred Shares on the day prior to the exchange date as determined in good faith by the Board of Directors of the General Partner.

(c) Adjustment of Exchange Price.

(i) The Exchange Price is subject to adjustment upon certain events, including, (A) subdivisions, combinations and reclassification of the Series D Preferred Shares, and (B) distributions to all holders of Series D Preferred Shares of evidence of indebtedness of the General Partner or assets (including securities, but excluding dividends and distributions paid in cash out of equity applicable to Series D Preferred Shares).

(ii) In case the General Partner shall be a party to any transaction (including, without limitation, a merger, consolidation, statutory share exchange, tender offer for all or substantially all of the General Partner's capital stock or sale of all or substantially all of the General Partner's assets), in each case as a result of which the Series D Preferred Shares will be converted into the right to receive shares of capital stock, other securities or other property (including cash or any combination thereof), each Series D Preferred Unit will thereafter be exchangeable into the kind and amount of shares of capital stock and other securities and property receivable (including cash or any combination thereof) upon the consummation of such transaction by a holder of that number of Series D Preferred Shares or fraction thereof into which one Series D Preferred Unit was exchangeable immediately prior to such transaction. The General Partner may not become a party to any such transaction unless the terms thereof are consistent with the foregoing.

(d) No Rights Under Article XI. Holders of Series D Preferred Units shall not be entitled to any "Rights" provided to Limited Partners pursuant to Article XI of the Partnership Agreement.

SECTION 10. No Conversion Rights. The holders of the Series D Preferred Units shall not have any rights to convert such shares into shares of any other class or series of shares or into any other securities of, or interest in, the Partnership.

SECTION 11. No Sinking Fund. No sinking fund shall be established for the retirement or redemption of Series D Preferred Units.

SECTION 12. Admission of Limited Partners: Exhibits to Partnership. In accordance with Section 4.1 of the Partnership Agreement, Mosaic VI REIT is hereby admitted as an Additional Limited Partner. Schedule A to the Partnership Agreement is hereby amended to reflect the issuance of the Series D Preferred Units provided for herein.

SECTION 13. Miscellaneous.

(a) The parties hereto agree that the holders of Series D Preferred Units shall not be deemed "Limited Partners" for the purpose of calculating the ownership level of limited partners as contemplated by Section 7.2 of the Partnership Agreement.

(b) For greater clarity, Article XIII of the Partnership Agreement shall not apply to Mosaic VI REIT or to its affiliates, successors and assigns or to their interests in the Partnership.

SECTION 14. Reaffirmation. Except as modified herein, all terms and conditions of the Partnership Agreement shall remain in full force and effect, which terms and conditions the General Partner hereby ratifies and affirms.

In Witness Whereof, this Amendment has been executed as of the date first above written.

GENERAL PARTNER
LIBERTY PROPERTY TRUST

BY:  /s/ WILLARD G. ROUSE, III
------------------------------
Name:  WILLARD G. ROUSE, III
Title: Chairman & Chief Executive Officer

ADDITIONAL LIMITED PARTNER
JPM MOSAIC VI REIT, INC.

BY: /s/ ANDREW CRAIGHEAD
------------------------------
Name:  ANDREW CRAIGHEAD
Title: Sole Director