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CHICAGO — Transwestern has brokered a 7-year, 17.983-square-foot office lease on behalf of WH Trading in downtown Chicago. The proprietary trading firm has tripled its office space through its expansion into space located within the 31-story, 553,884-square-foot 125 South Wacker Drive office tower. Tony Karmin and Corby Marx of Transwestern negotiated the lease on behalf of WH Trading; Samuel Schaefer represented the undisclosed landlord.