In all zones, for every building or part thereof hereafter erected, which is to be occupied by manufacturing, storage, goods display, retail store, wholesale store or warehouse, market, hospital, laundry, dry cleaning or other use similarly requiring the receipt or distribution in vehicles of materials or merchandise, there shall be provided and maintained on the same premises with such building at least one off-street loading space independent of required off-street parking area with access to a street. Each loading space shall be at least 10 feet in width, 50 feet in length and have a fourteen-foot clearance above grade. Such space may occupy all or part of the required side or rear yard only.