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                                                                   Exhibit 10.11


                                 FIRST AMENDMENT

         This First Amendment (the "Amendment") is made and entered into as of
the 31st day of March, 1998, by and between EOP-CANTERBURY GREEN, L.L.C., A
DELAWARE LIMITED LIABILITY COMPANY ("Landlord") and TRENWICK AMERICA
CORPORATION, A DELAWARE CORPORATION ("Tenant").

                                   WITNESSETH

A.       WHEREAS, Landlord and Tenant are parties to that certain lease dated
         the 29th day of January, 1998, (the "Lease") for space currently
         containing approximately 22,797 rentable square feet on the second
         (2nd) floor (the "Second Floor Space") and 11,699 rentable square feet
         on the fourth (4th) floor (the "Fourth Floor Space") (collectively, the
         "Premises") of the building commonly known as One Canterbury Green and
         the address of which is One Canterbury Green, Stamford, Connecticut
         (the "Building"); and

B.       WHEREAS, Coopers & Lybrand ("Coopers") currently leases space
         containing approximately 22,832 rentable square feet on the third (3rd
         floor of the Building and Coopers has not exercised its option to
         extend the term of its lease (the "Coopers Lease") for such space and
         therefore, upon the expiration of Coopers Lease, such space shall be
         available for leasing to Tenant; and

C.       WHEREAS, Tenant is hereby exercising its option (the "Substitution
         Option" as defined in Section I.A.5 of the Lease) to substitute the
         Third Floor Space for the Fourth Floor Space pursuant to Section I.A.5
         of the Lease and, in addition, is leasing the remainder of the space on
         the third floor of the Building. Accordingly, for purposes hereto the
         term "Third Floor Space" shall mean 22,832 square feet on the third
         floor of the Building; and

D.       WHEREAS, Tenant and Landlord mutually desire that the Lease be amended
         on and subject to the terms and conditions hereinafter set forth;

          NOW, THEREFORE, in consideration of the mutual covenants and
          agreements herein contained and other good and valuable consideration,
          the receipt and sufficiency of which are hereby acknowledged, Landlord
          and Tenant agree as follows:

         1.       PREMISES. Effective as of the date hereof (the "Effective
                  Date") Section l.A.5 of the Lease shall be deleted in its
                  entirety and the following inserted in lieu thereof:

                  "5       "Premises" shall be deemed to mean the area outlined
                           on Exhibits A and A1 attached hereto. Landlord and
                           Tenant hereby stipulate and agree that the Rentable
                           Area of the Premises shall be deemed to mean 45,629
                           square feet, consisting of 22,797 square feet on the
                           second (2nd ) floor as shown on Exhibit A attached
                           hereto (the "Second Floor Space") and 22,832 square
                           feet on the third (3rd) floor as shown on Exhibit A-1
                           attached hereto. Tenant acknowledge that the space on
                           the third floor is currently demised into two
                           separate parcels of space, the first of which
                           contains 13,936 square feet ("Space A") and the
                           second of which contains 8,896 square feet ("Space
                           B"). Tenant further acknowledges that Space B may be
                           delivered to Tenant subsequent to the delivery of the
                           Second Floor 
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                  Space and Space A (together, the "Initial Space");
                  accordingly, the Commencement Date with respect to such spaces
                  may occur at separate times. In the event the Commencement
                  Date for Space B occurs subsequent to the Commencement Date
                  for the Initial Space, the Lease Term shall be determined
                  based upon the initial Commencement Date, it being agreed that
                  the Lease Term for the Initial Space and Space B shall expire
                  coterminously. The "Rentable Area of the Building" shall mean
                  217,500 square feet. If the Premises being leased to Tenant
                  hereunder include one or more floors within the Building in
                  their entirety, the definition of Premises with respect to
                  such full floor(s) shall include all corridors and restroom
                  facilities located on such floor(s). Unless specifically
                  provided herein to the contrary, the Premises shall not
                  include any telephone closets, electrical closets, janitorial
                  closets, equipment rooms or similar areas on any full or
                  partial floor that are used by Landlord for the operation of
                  the Building."


         1.       BASE RENTAL. Effective as of the Effective Date, Section I.A.2
                  of the Lease shall be deleted in its entirety and the
                  following inserted in lieu thereof:

         "2.      "Base Rental" shall mean the sums that Tenant is required to
                  pay to Landlord in accordance with the following schedule.

                  a.       sixty (60) equal installments of one hundred eighteen
                           thousand two hundred fifty five and 15/100 dollars
                           ($118,255.15), each payable on or before the first
                           day of each month during the period beginning on the
                           Commencement Date (hereinafter defined) and ending on
                           the last day of the sixtieth (60) full calendar month
                           of the Lease Term, provided that the installment of
                           Base Rental for the third (3rd) full calendar month
                           of the Lease Term shall be payable upon the execution
                           of this Lease by Tenant. Notwithstanding the
                           foregoing, the amount of such monthly installments of
                           Base Rental is subject to modification as follows:

                            (i)In the event that the Commencement Date for Space
                            B occurs after the Commencement Date for the Initial
                            Space, Tenant shall only be required to pay Base
                            Rental with respect the Initial Space. In such case,
                            the monthly installment of Base Rental as of the
                            Commencement Date would be $95,199.70 and, upon the
                            occurrence of the Commencement Date with respect to
                            Space B, the monthly installment of Base Rental
                            would increase by $23,055.45 to be $118,255.15;

                            (ii) In the event the Commencement Date does not
                            occur on the first day of a calendar month (or in
                            the event the Commencement Date with respect to a
                            particular space does not occur on the first day of
                            a calendar month), Base Rental with respect to such
                            initial calendar month shall be appropriately
                            prorated based upon a percentage the numerator of
                            which is the number of days of Lease Term that fall
                            within such calendar month and the denominator of
                            which in the total number of days in such calendar
                            month;

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                            (iii) provided Tenant is not in default after the
                            expiration of applicable cure periods, Tenant shall
                            be entitled to receive a full abatement of Base
                            Rental with respect to the first sixty (60) days of
                            the Lease Term (the "Abatement Period"). If the
                            Lease Term with respect to the entire Premises does
                            not occur on the same day, such Abatement Period
                            shall be determined separately with respect to each
                            space comprising the Premises. In addition to
                            performing Initial Alterations (hereinafter defined)
                            during the Abatement Period, Tenant shall be
                            entitled to use the Premises for the Permitted Use
                            during the Abatement Period without any obligation
                            to pay Base Rental.

                  b.       sixty (60) equal installments of one hundred
                           twenty-nine thousand six hundred sixty-two and 41/100
                           Dollars ($129,662.41), each payable on or before the
                           first day of each month during the period beginning
                           on the first day of the sixty-first (61st) full
                           calendar month of the Lease Term and ending on the
                           Termination Date (hereinafter defined)."

3.       COMMENCEMENT DATE. Effective as of the Effective Date, Section 1.A.4 of
         the Lease shall be deleted in its entirety and the following inserted
         in lieu thereof:

         "4.      The "Commencement Date," "Lease Term" and "Termination Date"
                  shall have the meanings set forth in subsection l.A.4.a. below
                  or subsection l.A.4.b. below (delete one):

                  a.       The "Lease Term" shall mean a period of one hundred
                           twenty (120) months commencing on the Commencement
                           Date, provided if the Commencement Date does not
                           occur on the first day of a calendar month, the Lease
                           Term shall automatically be extended by the number of
                           days in the period beginning on the Commencement Date
                           and ending on the last day of the month in which the
                           Commencement Date occurs. For purposes hereof, the
                           Commencement Date shall mean (i) with respect to the
                           Initial Space, the date on which Landlord delivers
                           the Initial Space to Tenant free from occupancy by
                           (x) NationsCredit Commercial Corporation ("Nations"),
                           the existing tenant in the Second Floor Space; (y)
                           Coopers, the existing tenant in Space A or (z) other
                           party; and (ii) with respect to Space B, the date on
                           which Landlord delivers Space B to Tenant free from
                           occupancy by Coopers, the existing tenant in Space B,
                           or any other party. The "Termination Date" shall,
                           unless sooner terminated as provided herein, mean the
                           last day of the Lease Term.

                           Tenant acknowledges that Nations is currently leasing
                           the Second Floor Space pursuant to the terms of a
                           lease (the "Nations Lease") that is currently
                           scheduled to expire on September 16, 1998. Landlord
                           agrees to use good faith efforts to negotiate an
                           agreement with Nations pursuant to which the Nations
                           Lease would terminate prior to its scheduled
                           expiration date. Tenant also acknowledges that
                           Coopers is currently leasing the Third Floor Space
                           pursuant to the terms of the Coopers Lease, which
                           lease is currently scheduled to expire on November
                           17, 1998.

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                           Furthermore, Tenant acknowledges that Space A is
                           currently sublet by Coopers to Nations. Landlord
                           agrees to use good faith efforts to negotiate an
                           agreement with Coopers pursuant to which the Landlord
                           would be able to terminate the Coopers Lease with
                           respect to Space A before the stated expiration date
                           thereof. In the event Landlord enters into such
                           agreements accelerating the expiration dates of the
                           Nations Lease and the Coopers Lease, Landlord shall
                           provide Tenant with written notice (the "Early
                           Commencement Notice") setting forth the date on which
                           Landlord intends to provide Tenant with possession of
                           the Initial Space (i.e. the targeted Commencement
                           Date). Such Early Commencement Notice shall be
                           delivered to Tenant not less than fifteen (15) days
                           prior to the date on which Landlord intends to
                           provide Tenant with possession of the Initial Space.
                           Notwithstanding the foregoing, in no event shall the
                           Commencement Date occur prior to May 1, 1998 without
                           the written consent of Tenant.

                           In addition, Tenant acknowledges that Space B is
                           currently sublet by Coopers to Howard Systems and
                           that Landlord shall have the right to permit Howard
                           Systems to remain in Space B beyond the expiration of
                           the Coopers Lease. As of the date hereto it is
                           anticipated that Howard Systems may need to remain in
                           Space B until December 31,1998 (i.e. the targeted
                           Commencement Date of Space B is January 1, 1999).
                           Landlord shall provide Tenant with written notice
                           (the "Space B Notice") setting forth the date on
                           which Landlord intends to provide Tenant with
                           possession of Space B. Such Space B Notice shall be
                           delivered to Tenant not less than ten (10) days prior
                           to the date on which Landlord intends to provide
                           Tenant with possession of Space B. Notwithstanding
                           the foregoing, in no event shall the Commencement
                           Date for Space B occur prior to May 1, 1998 without
                           Tenant's consent.

                  b.       Intentionally Omitted."

4.       PRO RATA SHARE. Effective as of the Effective Date, Section 1 .A.8 of
         the Lease shall be deleted in its entirety and the following inserted
         in lieu thereof

         "8.      "Tenant's Pro Rata Share" shall mean TWENTY AND NINETY-EIGHT
                  ONE HUNDREDTHS PERCENT (20.98%), which is the quotient
                  (expressed as a percentage), derived by dividing the Rentable
                  Area of the Premises by the Rentable Area of the Building.
                  Notwithstanding the foregoing, if the Commencement Date with
                  respect to the entire Premises does not occur on the same day,
                  Tenant's Pro Rata Share shall be calculated only with respect
                  to the portion of the Premises for which the Commencement Date
                  has occurred. Based upon the assumption that Space B will not
                  be delivered until after the delivery of the Initial Space,
                  Tenant's Pro Rata Share as of the Commencement Date for the
                  Initial Space would be 16.89%. Upon the occurrence of the
                  Commencement Date with respect to Space B, Tenant's Pro Rata
                  Share would increase by 4.09% to be 20.98%.

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5.       ALLOWANCE. Effective as of the Effective Date, the first and second
         sentences of Section l.B of Exhibit D of the Lease shall be deleted in
         its entirety and the following inserted in lieu thereof:

           "Provided Tenant is not in default, Landlord agrees to contribute the
           sum of four hundred fifty-six thousand two hundred ninety and 00/100
           dollars ($456,290.00) (the "Allowance") toward the cost of performing
           the Initial Alterations in preparation of Tenant's occupancy of the
           Premises."

6.       RIGHT OF FIRST OFFER. Effective as of the Effective Date, Section 2 of
         Exhibit E of the Lease shall be deleted in its entirety.

7.       EXHIBITS A AND A-1. Effective as of the Effective Date, the Exhibit A
         attached to this Amendment shall be substituted for the Exhibit A
         attached to the Lease and all references to Exhibit A in the Lease
         shall be deemed to be a reference to the Exhibit A attached hereto.
         Effective as of the Effective Date, the Exhibit A-1 attached to this
         Amendment shall be substituted for the Exhibit A-1 attached to the
         Lease and all references to Exhibit A-1 in the Lease shall be deemed to
         be a reference to the Exhibit A-1 attached hereto.

8.       SUBSTITUTION OPTION: PARKING. Effective as of the Effective Date and in
         accordance with the provisions contained in the Lease and this
         Amendment, Landlord and Tenant hereby acknowledge and agree that Tenant
         has effectively exercised ifs Substitution Option and any references in
         the Lease to Tenant's exercise of its Substitution Option shall be
         deemed to have occurred. Tenant hereby exercises its right to lease all
         of the additional non-reserved parking spaces to which Tenant is
         entitled pursuant to Section 1.A. of Exhibit E of the Lease as a result
         of Tenant's exercise of the Substitution Option and its lease of
         additional space on the third floor of the Building.

9.       MISCELLANEOUS.

         A.       This Amendment sets forth the entire agreement between the
                  parties with respect to the matters set forth herein. There
                  have been no additional oral or written representations or
                  agreements. Under no circumstances shall Tenant be entitled to
                  any Rent abatement, improvement allowance, leasehold
                  improvements, or other work to the Premises, or any similar
                  economic incentives that may have been provided Tenant in
                  connection with entering into the Lease, unless specifically
                  set forth in this Amendment.

         B.       Except as herein modified or amended, the provisions,
                  conditions and terms of the Lease shall remain unchanged and
                  in full force and effect.

         C.       In the case of any inconsistency between the provisions of the
                  Lease and this Amendment, the provisions of this Amendment
                  shall govern and control.

         D.       Submission of this Amendment by Landlord is not an offer to
                  enter into this Amendment but rather is a solicitation for
                  such an offer by Tenant. Landlord shall not be bound by this
                  Amendment until Landlord has executed and delivered the same
                  to Tenant.

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         E.       The capitalized terms used in this Amendment shall have the
                  same definitions as set forth in the Lease to the extent that
                  such capitalized terms are defined therein and not redefined
                  in this Amendment.

         F.       Tenant hereby represents to Landlord that Tenant has dealt
                  with no broker other than the Broker (as defined in the Lease)
                  in connection with this Amendment. Tenant agrees to indemnify
                  and hold Landlord, its members, principals, beneficiaries,
                  partners, officers, directors, employees, mortgagee(s) and
                  agents, and the respective principals and members of any such
                  agents (collectively, the "Landlord Related Parties") harmless
                  from all claims of any brokers other than the Broker claiming
                  to have represented Tenant in connection with this Amendment.
                  Landlord hereby represents to Tenant that Landlord has dealt
                  with no broker in connection with this Amendment. Landlord
                  agrees to indemnify and hold Tenant, its members, principals,
                  beneficiaries, partners, officers, directors, employees, and
                  agents, and the respective principals and members of any such
                  agents (collectively, the "Tenant Related Parties") harmless
                  from all claims of any brokers claiming to have represented
                  Landlord in connection with this Amendment.



          IN WITNESS WHEREOF, Landlord and Tenant have duly executed this
Amendment as of the day and year first above written.

WITNESS/ATTEST:                 LANDLORD: EOP-CANTERBURY GREEN,
                                L.L.C., a Delaware limited liability company

                                    By:  EOP Operating Limited Partnership, 
                                         a Delaware limited partnership, its
                                         managing member

                                    By:  Equity Office Properties Trust,
                                         a Maryland real estate investment 
                                         trust, its managing general partner


s/Sarah L. Willis
- -----------------                        By: s/Thomas Q. Bakke
Name: Sarah Willis                          ---------------------
                                         Name: Thomas Q. Bakke
                                         Title: Vice President


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WITNESS/ATTEST:                 TENANT: TRENWICK AMERICA
                                        CORPORATION, a Delaware
                                        corporation

s/Michelle R. Diener                    By: s/James F. Billett, Jr.
- --------------------                    ---------------------------
Name: Michelle R. Diener                Name: James F. Billett, Jr.
- ------------------------                ---------------------------

s/Deborah L. Nichols                    Title: Chairman, President &
- -----------------------                        Chief  Executive Officer
Name: Deborah L. Nichols
- ------------------------










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