FIRST AMENDMENT TO OFFICE LEASE

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Exhibit 10(f)

FIRST AMENDMENT TO OFFICE LEASE

        THIS FIRST AMENDMENT TO OFFICE LEASE (this "First Amendment") is made as of the 1 ^st day of July, 2004 by and between TDC CANADA, INC. , a Canadian corporation and WACKER GP, INC. , a Delaware corporation (collectively, " Landlord" ) and QUIXOTE CORPORATION , a Delaware corporation (" Tenant" ),

WITNESSETH:

        A.    Landlord and Tenant entered into a certain office lease (the "Lease") dated August 30, 2003, whereby Landlord leased to Tenant certain premises (the "Original Premises") consisting of 18,789 rentable square feet of office space on the eleventh (11 ^th ) floor (Suite 1100) of that certain office building located at 35 East Wacker Drive, Chicago, Illinois, for a lease term to expire on February 28, 2019.

        B.    Landlord and Tenant desire to amend the Lease to reflect the lease by Landlord to Tenant of certain additional space located on the eleventh (11 ^th ) floor of the aforesaid building, subject to the terms and conditions hereinafter set forth.

         NOW, THEREFORE, for good and valuable consideration, the receipt and legal sufficiency of which are hereby acknowledged, Landlord and Tenant hereby agree as follows:

        1.     Definitions.     Each capitalized term used in this First Amendment shall have the same meaning as is ascribed to such capitalized term in the Lease, unless otherwise provided for herein.

        2.     First Additional Space.     

        (a)   Landlord leases to Tenant and Tenant leases from Landlord those certain premises (the "First Additional Space") containing 125 rentable square feet of office space located on the eleventh (11 ^th ) floor (Suite 1110) of the Building, as shown on Exhibit A attached hereto. The First Additional Space is leased for a lease term commencing on July 1, 2004 and expiring on February 28, 2019, unless sooner terminated as provided in the Lease and subject to renewal as provided in Paragraph 2(e) below. Tenant may take occupancy of the First Additional Space on or after the full execution of this First Amendment. The First Additional Space is leased upon all of the same terms and provisions as are contained in the Lease, except as otherwise provided in this First Amendment or as may be inconsistent with the provisions of this First Amendment. From and after the full execution of this First Amendment, all references in the Lease to "Premises" shall mean and refer to the Original Premises and the First Additional Space, collectively.

        (b)   Effective as of July 1, 2004, Tenant shall pay Base Rent for the First Additional Space in the following amounts for the following periods:

FIRST ADDITIONAL SPACE (125 RSF)

        (c)   Effective as of July 1, 2004, Tenant shall pay Additional Rent under Section 4.2 of the Lease for the First Additional Space and with respect to the First Additional Space, (i) "Base Year" shall mean 2004, and (ii) "Tenant's Share" shall mean 0.0241%.

        (d)   Exhibit B attached to the Lease shall apply to the First Additional Space, but with respect to the First Additional Space, "Landlord's Allowance" (or the "Allowance" or "Landlord's Contribution") shall mean and be $8,125.00 (i.e., $65.00 per rentable square foot of the First Additional Space). By taking possession of the First Additional Space hereunder, Tenant accepts the First Additional Space as being in good order, condition and repair, and otherwise "As-Is", "Where-Is" and with all faults, known or unknown.

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