Loading space for business and industry. Any business or industrial building, hospital, institution, hotel, mortuary or warehouse hereafter erected, constructed, reconstructed or altered shall provide adequate off-street parking facilities for the loading and unloading of merchandise and goods within or adjacent to the building in such manner as not to obstruct freedom of traffic movement on the public streets or alley. One (1) space shall be provided and maintained for each ten thousand (10,000) square feet or fraction thereof of gross floor area in excess of five thousand (5,000) square feet.