Except as otherwise provided, no building, structure or premises shall be used so as to produce greater heights, smaller yards or less unoccupied area and no building shall be occupied by more families than otherwise required for such building for the district in which it is located. No lot which is now or may be hereafter improved as herein shall be smaller than prescribed by this Zoning Ordinance and no yard, court or open space provided about any building as shown on the plat thereof, accompanying the application for a building permit for the purpose of complying with the provisions hereof, shall again be used as a yard, court or other open space for another building.
(1955 Code. §1153.01)