Exhibit 10.4





Exhibit 10.4








THIRD AMENDMENT TO CONTRACT FOR PURCHASE AND SALE OF REAL ESTATE






             THIS THIRD AMENDMENT TO
CONTRACT FOR PURCHASE AND SALE OF REAL ESTATE (this “Amendment”) is
made as of the 15th day of October, 2003 (the “Effective Date”) by and
between The Keller Manufacturing Company, Inc., an Indiana corporation
(“Seller”), and Structural Systems, Inc., a Maryland corporation
(“Purchaser”).




RECITALS: 



     
        A.       
          Purchaser and Seller are parties to a certain Contract for Purchase and Sale of
          Real Estate made and entered into as of April 16, 2003, as amended by a certain
          Amendment to Contract for Purchase of Real Estate dated as of August 14, 2003,
          and as further amended by a certain Second Amendment to Contract for Purchase
          and Sale of Real Estate dated as of October 13, 2003 (together, the
          “Contract”).



     
        B.       
          The Diligence Period under the Contract will expire on October 15, 2003.
          Purchaser and Seller wish to extend the Diligence Period for an additional five
          (5) days, solely with respect to Purchaser’s Tests and Studies regarding
          the environmental condition of the Real Estate.



        
NOW, THEREFORE, in consideration of the foregoing premises and the mutual
covenants and agreements set forth below, Purchaser and Seller hereby agree as
follows:



1.        Paragraph 4 of the
Contract is hereby amended to extend the Diligence Period, solely as it relates
to Purchaser’s Tests and Studies regarding the environmental condition of
the Real Estate, for an additional five (5) days, such that Purchaser’s
Diligence Period with respect to its Tests and Studies regarding the
environmental condition of the Real Estate shall expire on October 20, 2003 at
5:00 pm EST. Purchaser acknowledges and agrees that, except for its Tests and
Studies regarding the environmental condition of the Real Estate, Purchaser has
completed and is satisfied with its due diligence regarding the Real Estate and
with the results of its Tests and Studies regarding the Real Estate.




2.        The recitals set forth
above are hereby incorporated into this Amendment by reference. Except as
specifically amended or modified pursuant to this Amendment, the terms of the
Contract shall remain in full force and effect. This Amendment may be executed
in counterparts, each of which shall be deemed an original and all of which,
taken together, shall constitute one and the same instrument. Facsimile
signatures of the parties on this Amendment shall be effective as original
signatures. This Amendment shall not be effective until it has been signed by
both parties. Capitalized terms used but not otherwise defined in this Amendment
shall have the meanings set forth in the Contract.




        IN WITNESS WHEREOF,
Purchaser and Seller have caused their duly authorized representatives to
execute this Amendment as of the Effective Date set forth above.



	
"PURCHASER"



Structural Systems, Inc.





By:  /s/ AJ Brasauskas

Printed:  Algirdas J. Brasauskas

Its:  CFO


	
"SELLER"



The Keller Manufacturing Company, Inc.





By:  /s/ David T. Richardson

Printed:  David T. Richardson

Its:  CFO