Clayton, MO-based Spartech Plastics, a division of Spartech Corp., leased 60,206 square feet at 514 Great Southwest Parkway. The company signed a five-year lease, which begins on July 1, however, the firm has already taken occupancy. The company is relocating from 840 N. Great Southwest Parkway. Gordon Foster of Foster & Co. brokered for the company. Joe Rudd of ProLogis represented the landlord. Spartech produces engineered thermoplastic materials, polymeric compounds and molded and profile products.