The Space Shuttle Endeavour’s new home at the California Science Center is a massive steel structure, designed by Portland, Oregon-based Zimmer Gunsul Frasca Architects (ZGF). The hall measures 70 feet tall and about 17,400 sf in area. Built on a polished concrete slab with seismic steel bracing and steel panels, it runs six bays long and five bays wide. The bracing is extra robust so that the entire west wall could be removed during the shuttle’s arrival.