FFC Union Station: Dedicated to help you meet your health and fitness goals. Occupying the landmark space that was once the Chicago Mercantile Exchange, FFC’s Union Station fitness center is the largest full-service health and fitness club in the Loop. Covering over 85,000 sq.ft., this spectacular first class facility sits at street level at 444 West Jackson Blvd and is literally above the Union Station train commuting center. The ultimate convenience Club for Loop commuters.