The Mercantile Building was built and used at the 1949 fair.  During the fair it is used to showcase various local vendors.  Year-round this building hosts various types of shows including antique shows gun shows, train shows, motorcycle and auto swap meets, and rabbit shows.  Renovations and upgrades recently provided by a grant from the Clark County Commissioners, include insulating the ceiling and the installation of air conditioning and heating system.  These upgrades have led to addition of new uses including several wedding receptions.  The restaurant in the rear of the building is the only one permanently available in any of the exhibit buildings.