"Business district" means the territory fronting upon a street or highway, including the street or highway, between successive intersections within the municipality, where 50% or more of the frontage between successive intersections is occupied by buildings in use for business, or within or outside the municipality where 50% 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 the territory is indicated by official traffic-control devices.
(ORC 4511.01(NN))