Exhibit 99.6


                    FIRST AMENDMENT TO OPERATING AGREEMENT OF
                        LEXINGTON ACQUIPORT COMPANY, LLC


         This FIRST  AMENDMENT  TO OPERATING  AGREEMENT  OF LEXINGTON  ACQUIPORT
COMPANY,  LLC (this  "Amendment")  made as of the 5th day of  December,  2001 by
Lexington  Corporate  Properties Trust, a Maryland real estate investment trust,
as a managing  member  ("LXP") and The  Comptroller of the State of New York, as
Trustee of the Common  Retirement  Fund, as a non-managing  member (the "Fund").
LXP and the Fund are sometimes individually referred to herein as a "Member" and
collectively referred to herein as the "Members".  All capitalized terms used in
this Amendment without definition shall have the respective meanings ascribed to
them in the Agreement (as defined below).

                              W I T N E S S E T H:
                               -------------------

         WHEREAS,  LXP and the Fund entered into the  Operating  Agreement  (the
"Agreement") of Lexington  Acquiport Company,  LLC, a Delaware limited liability
company (the "Company"), dated as of July 14, 1999;

         WHEREAS, Section 12.12 of the Agreement provides that the Agreement may
be amended only upon the written consent of all the Members;

         WHEREAS, LXP and the Fund, constituting all the Members of the Company,
hereby desire to supplement and amend the Agreement as provided herein; and

         NOW,  THEREFORE,  in  consideration of the premises and the agreements,
provisions  and  covenants  herein  contained the Members amend the Agreement as
follows:

                                   ARTICLE I
                        AMENDMENTS TO OPERATING AGREEMENT

         A. Amendments to Definitions.  The following  definitions  contained in
Section  1.1 of the  Agreement  are amended  and  restated in their  entirety as
follows:

              "Asset  Manager"  shall mean a  corporation,  the capital stock of
         which is held from time to time  either  wholly by LXP or partly by LXP
         with the voting  stock and value held in a manner so as to satisfy  LXP
         in its sole discretion  that such ownership will meet any  requirements
         imposed on LXP with  respect to its status as a real estate  investment
         trust under the Code.

              "Management  Agreement" shall mean the agreement between the Asset
         Manager  and the  Company  dated as of July 14, 1999 as amended by that
         First Amendment to Management  Agreement,  and as such may from time to
         time be further amended,  supplemented or otherwise  modified from time
         to time.

              "Operating  Expenses"  shall mean (x) all reasonable and customary
         costs and expenses of Third  Parties  retained in  connection  with the
         ownership, leasing, operation, repair and maintenance of the Tranche II
         Properties  and (y) real  estate  taxes,  insurance




         premiums, utility charges, rent collection and lease enforcement costs,
         brokerage  commissions  to  the  extent  applicable  to the  period  in
         question (but excluding any acquisition  fees payable to the Manager or
         the Asset Manager under Section 3.6(g) hereof),  maintenance  expenses,
         costs of repairs and  replacements  (which,  under  generally  accepted
         accounting principles  consistently applied, may be expensed during the
         period when made) and  management  fees (but  excluding any  management
         fees or the  Oversight  Fee  payable to the  Manager  or Asset  Manager
         pursuant to Section  3.10(c)  hereof) in connection with the ownership,
         leasing,   operation,   repair  and   maintenance  of  the  Tranche  II
         Properties.   Operating   Expenses   shall  not  include   general  and
         administrative costs and overhead of the Company and debt payments."

         B.  Additional  Definitions.  Section  1.1 of the  Agreement  is hereby
modified  and amended by  inserting  therein the  following  definitions  in the
appropriate alphabetical order:

              "First  Amendment to Management  Agreement"  shall mean that First
         Amendment  to the  Management  Agreement,  dated as of the date hereof,
         substantially  in the form  attached  hereto as Exhibit  B-1 and made a
         part hereof.

              "Oversight Fee" is defined in Section 3.10(c) hereof.

         C. Section  3.10(c) of the Agreement is hereby  modified and amended by
deleting such section in its entirety and substituting the following therefore:

              "(c) Management Fee. The Manager shall cause the Company to pay to
         the Asset  Manager  (or to the  Manager  in the  event  the  Management
         Agreement is terminated) an annual  management fee equal to two percent
         (2%) of Net  Rents,  payable  monthly.  Such fee  shall  be  calculated
         monthly, based on Net Rents received by the Company for such month, and
         adjusted as provided  herein.  Within thirty (30) days of the Company's
         receipt of the annual  reports  described  in Section  4.3 hereof for a
         fiscal year,  the Asset  Manager  shall  provide to the Advisor and the
         Fund a written  statement of  reconciliation  setting forth (a) the Net
         Rents for such fiscal year and the  management fee payable to the Asset
         Manager in connection  therewith,  pursuant to this Agreement,  (b) the
         management  fee already paid by the Company to the Asset Manager during
         such fiscal year,  and (c) either the amount owed to the Asset  Manager
         by the Company  (which shall be the excess,  if any, of the  management
         fee payable to the Asset  Manager for such fiscal year pursuant to this
         Agreement  over the  management fee actually paid by the Company to the
         Asset  Manager for such fiscal  year) or the amount owed to the Company
         by the  Asset  Manager  (which  shall  be the  excess,  if any,  of the
         management  fee actually  paid by the Company to the Asset  Manager for
         such fiscal year over the  management  fee payable to the Asset Manager
         for such fiscal year pursuant to this Agreement).  The Asset Manager or
         the Company, as the case may be, shall pay to the other the amount owed
         pursuant  to clause  (c) above  within  five (5)  Business  Days of the
         receipt  by the  Advisor  and the  Fund  of the  written  statement  of
         reconciliation  described in this  Section  3.10(c).  In addition,  and
         effective as of December ___, 2001, in those cases in which a tenant of
         any Property  requests  that the Company  provide  property  management
         services at such tenant's  expense,  Asset Manager shall be entitled to
         an oversight fee for such property  management  services for the tenant
         of such  Property  equal to one half of one percent

                                       2




         (0.50%) of the Net Rent from such  Property  ("Oversight  Fee"),  which
         Oversight  Fee shall be  payable  by the  tenant of such  Property,  in
         accordance  with the terms as such tenant and Asset  Manager may agree.
         Concurrently  with the  reconciliation  statement  required above,  the
         Asset  Manager  shall  provide  to the  Advisor  and the Fund a written
         statement  setting forth all  Oversight  Fees paid to the Asset Manager
         during such fiscal year and the Net Rents  relating to such  Properties
         for such fiscal year.

         D. Form of First Amendment. Exhibit A attached hereto is made a part of
the Agreement as Exhibit B-1 thereto.

                                   ARTICLE II
                               GENERAL PROVISIONS

         A.  Governing  Law. This  Amendment and the  obligations of the Members
hereunder  shall be  interpreted,  construed and enforced in accordance with the
laws of the State of Delaware without regard to its choice of law provisions.

         B. No Additional Amendment.  Except as modified by this Amendment,  the
Agreement and each of the terms and  provisions  thereof shall remain  unchanged
and in full force and effect in all respects.


         C.  Counterparts.  This  Amendment  may be  executed  in any  number of
counterparts and by the different parties hereto in separate counterparts,  each
of which when so executed and delivered  shall be deemed to be an original,  but
all such counterparts together shall constitute but one and the same instrument;
signature  and  acknowledgment  pages may be  detached  from  multiple  separate
counterparts  and attached to a single  counterpart  so that all  signature  and
acknowledgement  pages  are  physically  attached  to the  same  document.  This
Amendment shall become  effective upon the execution of a counterpart  hereof by
each of the  parties  hereto  and  delivery  to each of the  Members  of a fully
executed original counterpart of this Amendment.



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                                       3






         IN WITNESS WHEREOF, this Amendment is executed effective as of the date
first set forth above.

                           LXP, AS THE MANAGING MEMBER
                           ---------------------------


                           LEXINGTON CORPORATE PROPERTIES TRUST



                           By: /s/ Patrick Carroll
                               --------------------------------------------
                               Name: Patrick Carroll
                               Its:  Chief Financial Officer

                           THE FUND, AS A NON-MANAGING MEMBER
                           ----------------------------------


                           COMPTROLLER OF THE STATE OF NEW YORK, AS
                           TRUSTEE OF THE COMMON RETIREMENT FUND



                           By: /s/ John E. Hull
                               ------------------------------------------------
                               Name:   John E. Hull
                               Title:  Deputy Comptroller, Division of
                                      Investments and Cash Management

                                      S-1





                                    EXHIBIT A

                 FORM OF FIRST AMENDMENT TO MANAGEMENT AGREEMENT


         This FIRST AMENDMENT TO MANAGEMENT AGREEMENT (this "Amendment") made as
of the __ day of December,  2001 between  Lexington  Acquiport  Company,  LLC, a
Delaware  limited  liability  company  (the  "Company"),  and  Lexington  Realty
Advisors,  Inc., a Delaware  corporation (the "Asset Manager").  All capitalized
terms  used in this  Amendment  without  definition  shall  have the  respective
meanings ascribed to them in the Agreement (as defined below).

                              W I T N E S S E T H:
                               -------------------

         WHEREAS,  the Company and the Asset Manager entered into the Management
Agreement (the "Agreement") dated as of July 14, 1999;

         WHEREAS,  the Company and the Asset Manager hereby desire to supplement
and amend the Agreement as provided herein; and

         NOW,  THEREFORE,  in  consideration of the premises and the agreements,
provisions and covenants herein contained the parties hereto agree as follows:

                                   ARTICLE I
                        AMENDMENT TO MANAGEMENT AGREEMENT

         Section  11(b) of the  Agreement  is hereby  modified  and  amended  by
deleting such section in its entirety and substituting the following therefore:

              "(b)  The  Company  shall  pay  to the  Asset  Manager  an  annual
         management fee equal to two percent (2%) of Net Rents, payable monthly.
         Such fee shall be calculated  monthly,  based on Net Rents  received by
         the Company for such month,  and  adjusted as provided in this  Section
         11(b).  Within thirty (30) days of the Company's  receipt of the annual
         reports  described  in Section  4.3 of the  Operating  Agreement  for a
         fiscal year,  the Asset  Manager shall provide to the Company a written
         statement of  reconciliation  setting  forth (a) the Net Rents for such
         fiscal  year and the  management  fee  payable to the Asset  Manager in
         connection therewith,  pursuant to this Management  Agreement,  (b) the
         management  fee already paid by the Company to the Asset Manager during
         such fiscal year,  and (c) either the amount owed to the Asset  Manager
         by the Company  (which shall be the excess,  if any, of the  management
         fee payable to the Asset  Manager for such fiscal year pursuant to this
         Agreement  over the  management fee actually paid by the Company to the
         Asset  Manager for such fiscal  year) or the amount owed to the Company
         by the  Asset  Manager  (which  shall  be the  excess,  if any,  of the
         management  fee actually  paid by the Company to the Asset  Manager for
         such fiscal year over the  management  fee payable to the Asset Manager
         for such fiscal year pursuant to this Agreement).  The Asset Manager or
         the Company, as the case may be, shall pay to the other the amount owed
         pursuant  to clause  (c) above  within  five (5)  Business  Days of the
         receipt  by the




         Advisor  and  the  Fund  of the  written  statement  of  reconciliation
         described in this Section 11. In addition, and effective as of December
         __,  2001,  in those cases in which a tenant of any  Property  requests
         that the Company provide property  management services at such tenant's
         expense,  Asset  Manager shall be entitled to an oversight fee for such
         property  management  services for the tenant of such Property equal to
         one half of one  percent  (0.50%)  of the Net Rent from  such  Property
         ("Oversight  Fee"),  which Oversight Fee shall be payable by the tenant
         of such Property, in accordance with the terms as such tenant and Asset
         Manager  may  agree.  Concurrently  with the  reconciliation  statement
         required above,  the Asset Manager shall provide to the Advisor and the
         Fund a written  statement  setting forth all Oversight Fees paid to the
         Asset  Manager  during such  fiscal year and the Net Rents  relating to
         such Properties for such fiscal year."

                                   ARTICLE II
                               GENERAL PROVISIONS

         A. Governing Law. THIS AMENDMENT AND THE RIGHTS AND  OBLIGATIONS OF THE
PARTIES  HEREUNDER  SHALL BE GOVERNED BY, AND SHALL BE CONSTRUED AND ENFORCED IN
ACCORDANCE  WITH, THE INTERNAL LAWS OF THE STATE OF NEW YORK (INCLUDING  SECTION
5-1401 OF THE GENERAL OBLIGATIONS LAW OF THE STATE OF NEW YORK),  WITHOUT REGARD
TO CONFLICTS OF LAWS PRINCIPLES.

         B. No Additional Amendment.  Except as modified by this Amendment,  the
Agreement and each of the terms and  provisions  thereof shall remain  unchanged
and in full force and effect in all respects.

         C.  Counterparts.  This  Amendment  may be  executed  in any  number of
counterparts and by the different parties hereto in separate counterparts,  each
of which when so executed and delivered  shall be deemed to be an original,  but
all such counterparts together shall constitute but one and the same instrument;
signature  and  acknowledgment  pages may be  detached  from  multiple  separate
counterparts  and attached to a single  counterpart  so that all  signature  and
acknowledgement  pages  are  physically  attached  to the  same  document.  This
Amendment shall become  effective upon the execution of a counterpart  hereof by
each of the  parties  hereto  and  delivery  to each of the  Members  of a fully
executed original counterpart of this Amendment



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         IN WITNESS WHEREOF, this Amendment is executed effective as of the date
first set forth above.


COMPANY                LEXINGTON ACQUIPORT COMPANY,
                       LLC, a Delaware limited liability company

                       By:  LEXINGTON PROPERTIES CORPORATE
                            TRUST, a Maryland real estate investment trust,
                            the managing member


                            By:  ____________________________________________
                                 Name:
                                 Its:


ASSET MANAGER          LEXINGTON REALTY ADVISORS, INC.


                       By:  _________________________________
                            Name:
                            Its: