(a) The height limitations set forth in the District Schedules of Area and Bulk Regulations shall not be applicable to the following:
(1) Agricultural barns, silos and other farm buildings.
(2) Flagpoles, radio or television antennas, transmission towers or cables, windmills, communications towers, or masts and aerials, incidental and accessory to a principal use and similar features, any of which shall be restricted to a maximum height of seventy-five feet above average finished grade at its base.
(3) Spires, belfries, cupolas and domes, monuments, water towers, chimneys, smokestacks, skylights, water or cooling towers, elevators, stair bulkheads, solar collectors, air-conditioning units or similar structures which in their aggregate coverage occupy no more than ten percent of the roof area of the building of which they are an integral architectural or mechanical element. Such features shall be erected only to such minimum height as is necessary to accomplish the purpose for which they are intended and shall not extend more than twenty feet above the roof.
(4) Open amusement uses.
(5) Parapet walls and railings, except that parapet walls and railings may extend no more than four feet above the limiting height of the building.
(b) None of the above listed uses, or similar uses, shall be used as a place for habitation or for advertising not otherwise authorized by this chapter.