(a) There shall not be more than 1 one-family or 1 two-family dwelling located on a zoning lot; however, there may be more than one row house or apartment building on a zoning lot. No dwelling shall be erected to the rear of any building on the same lot, except in RMF or RRB Districts.
(b) In addition, there may be one or more accessory buildings on the same zoning lot with a main building in any residential district, provided the accessory building is constructed subsequent to the main building.
(1980 Code 151.22)