For every main or accessory building, the following minimum yards shall be provided:
(a)   Front Yard.  There shall be a setback of not less than 30 feet in depth, unless shown otherwise on the Zone Map;
(b)   Side and Rear Yards.  There shall be a yard not less than 50 feet where a building adjoins a side or rear lot line of a residential district;
(c)   All Required Yards.  The above front, side, and rear yards may be used for off-street parking, but not within 15 feet of a residential district line, and a fence or landscaping may be required by the Commission.
      (1980 Code 151.78)