In any business or in any industrial district, in connection with every building or part thereof hereafter erected, improved, altered or extended having a gross floor area of 10,000 10,000 square feet or more and which is to be occupied by manufacturing, storage, warehouse, goods display, retail store, wholesale store, market, hotel, hospital, mortuary, laundry, dry cleaning or other use similarly requiring the receipt or dispatch by vehicle of materials or merchandise there shall be provided and maintained on the same lot with such building at least one off-street loading space, plus one additional loading space for each 30,000 square feet, plus two additional loading spaces for each 50,000 square feet, plus three additional loading spaces for each 70,000 square feet.