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