(A) No front or side yards shall be required except when a building or group of buildings abuts a residential district, a yard shall be provided on the side of the lot abutting the residential district, the yard having a width of not less than ten feet.
(B) There shall be a rear yard with a depth of not less than 15 feet when abutting upon a publicly dedicated alley or public way and not less than 20 feet when no dedicated alley or public way exists at the rear of the lot. The rear yard may be used for off- street parking and loading, as provided in §§ 156.055 through 156.062.
('74 Code, Appendix A, § 8) Penalty, see § 156.999