On the same lot with every building or part thereof, erected hereafter to be used for other than exclusive dwelling purposes, or as an accessory use for dwelling purposes, there shall be provided on the lot adequate space for motor vehicles in order to avoid undue interference with the public use of streets or alleys.
(A) The space, unless otherwise adequately provided for, shall include a 10 x 25 foot loading space, with 15 feet height clearance.
(B) One space shall be provided for each 20,000 square feet or fraction thereof of floor or lot area used for other than residence purposes.
('74 Code, Appendix A, § 13) Penalty, see § 156.999