(a) Every main business, or commercial or manufacturing building in a commercial district shall be located on a lot not less than 66 feet wide, of sufficient area to provide the required yards and off-street parking, and not more than 50% of the lot area shall be covered with buildings.
(b) Provided, however, for a main business, or commercial or manufacturing building in a commercial district of which at least 75% was constructed prior to October 15, 1956, the Commission may by a conditional use permit allow the lot area covered by buildings to be increased to 65% if it determines that:
(1) No additional land can be readily acquired to maintain a 50% yard area after the construction of additional buildings, and
(2) The construction of additional buildings will not create additional fire, explosion, or other hazards, and
(3) Every reasonable effort has been made by the applicant to create sufficient off-street parking, and loading and unloading facilities, or
(4) The nature of the business conducted is such that coverage of area by buildings is great in comparison to the needed employee or customer parking or loading and unloading facilities, or
(5) The nature of the business conducted is such that much of the storage of goods or vehicles is in buildings.
(1980 Code 151.67)