The Gulf, Colorado and Santa Fe Railway built a complex of four buildings (three remaining) for offices and warehouses atop an underground network of tracks. Earlier depots from 1884 and 1896 had occupied the site, whose function was taken over by Union Station. The complex was the largest merchandising center in the region. Spanish Renaissance ornament is applied to the 4-story arched base and top attic floor of the 18-story tawny brick Building No. 1 (Santa Fe Office Building). Smooth brick piers divide the central five bays into continuous vertical shafts, with recessed windows and copper-green spandrels. A 10-story warehouse on the south side extends to Jackson Street. The federal government acquired the complex in 1942 and still maintains offices in Building No. 1. Building No. 2 at 1112 Jackson was renovated as SoCo Urban Lofts (1999, Corgan Associates).