"Business district" means the territory fronting upon a street or highway, including the street or highway, between successive intersections where fifty percent or more of the frontage between such successive intersections is occupied by buildings in use for business, or where fifty percent or more of the frontage for a distance of 300 feet or more is occupied by buildings in use for business, and the character of such territory is indicated by official traffic control devices. (ORC 4511.01(NN))