An architect's drawing shows a new exhibition hall planned for 9550 S. State. Salt Lake County leaders announced Friday that Layton Construction and Gillies Stransky Brems Smith Architects will build the hall, which has been dubbed the SouthTowne Exposition Center. Construction of the 250,000-square-foot building will begin in July and should be finished by 2000, Commissioner Brent Overson said. Commissioners say studies showed the $66 million building was needed to ease the load on the Salt Palace Convention Center, the county's sole venue for exhibitions, conventions and trade shows. The Sandy building's exhibit hall will be longer than three football fields, with some ceiling areas of the concourse reaching almost 40 feet high. It will include 1,500 parking spaces.