EXHIBIT 10.8.3




                        FIFTH AMENDMENT TO
                       CARBIDE CENTER LEASE



     THIS AMENDMENT, made as of June 30, 1994, between UNION 
CARBIDE CORPORATION (formerly known as UNION CARBIDE CHEMICALS 
AND PLASTICS COMPANY INC.), a New York corporation having offices 
at 39 Old Ridgebury Road, Danbury, Connecticut 06817 
("Landlord"), and PRAXAIR, INC. (formerly known as UNION CARBIDE 
INDUSTRIAL GASES INC.), a Delaware corporation having offices at 
39 Old Ridgebury Road, Danbury Connecticut 06817 ("Tenant"),
                       W I T N E S S E T H:
     WHEREAS, by Danbury Lease Agreement dated as of January 1, 
1989, as modified by First Amendment of Lease dated as of June 1, 
1989, Second Amendment of Lease dated as of October 24, 1990, 
Third Amendment to Carbide Center Lease dated as of June 4, 1992, 
and Fourth Amendment to Carbide Center Lease dated as of July 1, 
1992 (collectively, the "Lease"), Landlord has leased to Tenant 
certain office space in the building known as Carbide Center, 
Danbury, Connecticut, as more particularly identified in the 
Lease (the "Demised Premises"); and
     WHEREAS, Landlord is the tenant of Danbury Buildings, 
Inc.("Overlandlord"); and
     WHEREAS, the parties wish to amend the lease to clarify the 
computation of the Base Rent and the Additional Rent; 


     NOW, THEREFORE, in consideration of the Lease and the mutual 
undertakings set forth herein, Landlord and Tenant hereby amend 
the Lease effective as of July 1, 1992 as follows:

     1.   Section 1.03(a):  The Base Rent, as set forth in 
Section 1.03(a) of the Lease, shall be modified by deleting 
Exhibit C-3 from the Lease and Exhibit C-4 attached hereto shall 
be substituted in place thereof.

     2.   Section 3.06(a):  Section 3.06(a) shall be modified by 
adding the following subdivision:
          "(vii) costs incurred after April 30, 1994 by Landlord,
          after reasonable consultation with Tenant, that do not
          otherwise qualify hereunder as Operating Expenses and 
          that result in, and are directly related to, a net
          decrease in aggregate related Operating Expenses for
          the Building, as reasonably justified by Landlord, at
          least equivalent to such costs in the year incurred or
          thereafter (but not to exceed twenty-four (24)
          months)."

     3.   Section 3.06:  Delete subdivision (d) of Section 3.06.

     4.   Section 3.07:  Section 3.07 of the Lease shall be 
modified to read as follows:
          "3.07  Landlord shall furnish to Tenant on or about
          December 15 of each year a statement setting forth (i) 
          the estimated Operating Expenses for the forthcoming
          Operational Year, and (ii) Tenant's Proportionate Share
          of the Operating Expenses for the Operational Year
          (computed on the basis of such estimate).  Tenant shall
          pay to Landlord, together with each monthly installment
          of Base Rent, an amount equal to one-twelfth (1/12th)
          of Tenant's Proportionate Share of Operating Expenses
          as so estimated.  Landlord shall furnish to Tenant as 


          soon as practicable following the close of each
          Operational Year a detailed statement setting forth
          with respect to such Operational Year (i) the actual
          amount of the Operating Expenses, and (ii) the actual
          amount of Tenant's Proportionate Share of Operating 
          Expenses, adjusted to reflect the payments on account
          theretofore made by Tenant; and within thirty (30) days
          after receipt of such statement, Tenant shall pay to
          Landlord the amount so shown to be payable by Tenant.
          The Operating Expenses for any Operational Year which 
          is only partly within the Term shall be prorated.
          Landlord shall refund to Tenant any overpayment of
          Operating Expenses for any Operational Year within 
          thirty (30) days after presentation of Landlord's 
          statement of actual Operating Expenses or as soon as
          practicable after any termination of this Lease."

     5.   Section 3.09:  In Section 3.09 of the Lease, line 3, 
delete "any increase in."

     6.   Section 3.10 (New):  The following provision shall be 
added to the Lease:
          "3.10  Landlord shall inform Tenant within a reasonable
          period prior to (i) adopting annual operating budgets
          (commencing not later than October 30 in each
          Operational Year), (ii) extending or executing major 
          service agreements (viz., involving annual payments
          exceeding $100,000) or (iii) incurring extraordinary
          expenses (viz., exceeding $100,000) with respect to 
          Operating Expenses.  Such annual budgets shall be based
          upon reasonable, documented cost estimates."

     7.   Section 3.11 (New):  The following provision shall be 
added to the Lease:
          "3.11  On or before November 1, 1994, Tenant shall have
          the right to assume or decline, for the 1995 
          Operational Year and the balance of the Term,
          responsibility for those Operating Expenses comprising
          Tenant Services, as identified on Schedule I attached
          hereto; provided, however, that (i) Tenant shall give
          Landlord reasonable notice of any Tenant Services work


          it performs in excess of $2,000.00 per job, (ii) any
          Tenant Services work shall conform to Building standard
          as to materials and workmanship, (iii) Tenant shall be 
          liable for any damage to the Building due to such work,
          except to the extent of Landlord's negligence or
          willful misconduct, and (iv) Landlord and Tenant shall
          each promptly notify the other in writing of its 
          representative with respect to all matters concerning
          Tenant Services.  As to any safety or environmentally
          related items of Tenant Services, if Tenant does not
          perform any necessary repairs within forty-eight (48)
          hours after written notification from Landlord,
          Landlord may do so and invoice Tenant for the
          reasonable costs of such work.  At the request of 
          Tenant, after December 31, 1994, as to those Tenant
          Services for which Tenant has assumed responsibility, 
          Landlord shall perform such Tenant Services on a
          project basis at a mutually agreed upon cost in each
          instance."

     8.   Section 12.03 (New):  The following provision shall be 
added to the Lease:
          "12.03  Tenant shall have the right to use all
          telecommunications and computer wiring in the Building
          which now services the Demised Premises or the Linde
          Data Center located at 55 Old Ridgebury Road, Danbury,
          Connecticut (the "Linde Data Center"), to install its
          own telephone switching equipment for the Demised
          Premises and the Linde Data Center in Landlord's N-0
          telephone room and to use the telecommunications cables
          located between (i) Old Ridgebury Road and the Linde
          Data Center, (ii) the Linde Data Center and the
          Building, and (iii) Old Ridgebury Road and the
          Building.  Further, Tenant shall have the right to
          repair and replace, or cause to be repaired and
          replaced, any such telecommunications and computer
          wiring, switching equipment or cables.  Landlord shall
          cooperate fully to permit Tenant to receive
          telecommunications service at the Demised Premises and
          the Linde Data Center."



     9.   Tenant hereby acknowledges that Landlord is not 
required by the Lease and does not intend to seek the consent of 
Overlandlord with respect to this Amendment.

    10.   Landlord shall inform Tenant in advance of any 
modifications of the Prime Lease with Overlandlord and Landlord 
shall give to Tenant a reasonable opportunity to benefit from any 
transaction with Overlandlord reducing Landlord's payments to 
Overlandlord.  Tenant will take no benefit under the Lease from 
any decrease in Landlord's payments of Basic Rent, Additional 
Rent or other amounts to Overlandlord unless Tenant has 
contributed in a mutually agreed proportionate amount to the cost 
of obtaining any such decrease.  As used herein, "cost" shall 
include all costs and expenses incurred by Landlord and related 
to such reductions, whether paid to Overlandlord or to others, 
including but not limited to, prepayments of Basic Rent or 
Additional Rent and payment of transaction costs such as 
underwriting fees, legal fees, appraisal fees, survey fees, 
brokers' fees, or otherwise, of any nature whatsoever, whether 
similar or dissimilar to the foregoing.

    11.   All terms which are defined in the Lease shall have the 
same meaning when used herein.



    12.   Except as otherwise provided herein, the Lease shall 
remain in full force and effect.

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

                                     UNION CARBIDE CORPORATION



                                     By: Robert F.X. Fusaro 
                                         Attorney-in-Fact


                                     PRAXAIR, INC.	



                                     By: David H. Chaifetz 
                                         Vice President




                           EXHIBIT C-4

                            Base Rent



        Period                              Base Rent ($/Month)

1.  July 1992                               $221,020.10
    through December 1996

2.  January 1997 through                    $268,909.27
    December 2001

3.  January 2002 through                    $327,213.00
    December 2006




                           SCHEDULE I

                         Tenant Services


1.  Repair chairs/furniture
2.  Jammed cabinet/desk drawers
3.  Repair baseboards
4.  Adjust and/or repair ceiling panels
5.  Close and lost windows
6.  Repair/replace carpet and floor tiles
7.  Repair doors/latches for offices, closets and
    conference rooms
8.  Repair furniture locks
9.  Brushlon and vinyl repair
10. Tripping hazards
11. Missing/broken outlet covers
12. Hang pictures
13. Pendaflex frames
14. Extension cords
15. Adjust chairs
16. Relamping/no power call-lights
17. Replace sprinkler caps
18. Temperature complaints where HVAC meets Lease standard
19. Faucet leaks in K-1, K-2, M-1 and M-2 support areas
20. Restroom repairs caused by improper use of Tenant's employees