In all districts for every building or part thereof, which is to be occupied by manufacturing storage, goods, display, wholesale store or warehouse, market, hospital, laundry, dry cleaning or other use similarly requiring the receipt of distribution in vehicles of materials or merchandise, there shall be provided and maintained of the same premises with such buildings, off-street loading spaces. The minimum number of which shall be determined in relation to the gross floor area as follows:
(a)
Up to 15,000 square feet, one space.
(b)
Fifteen thousand to 30,000 feet, two spaces.
(c)
Thirty thousand to 100,000 square feet, three spaces.
(d)
One additional space for each additional 40,000 square feet or part thereof.