No principal or accessory building or structure shall exceed the height limits as prescribed in § 20-4.

Roof structures for the housing of stairways, tanks, ventilating fans, air-conditioning equipment or similar equipment required to operate and maintain the building; skylights; spires; cupolas; flagpoles; chimneys; or similar structures may be erected above the height limits prescribed by this chapter, but in no case more than 25% more than the maximum height prescribed for the use in the district. Farm silos shall have no height restrictions. Roof structures or cupolas for stairway or elevator access are not permitted above the required building height in the RR and RC Zones.

Any building having a roof slope less than 4:1 for more than 25% of the building shall be considered a flat roof, and the prescribed building height limit in § 20-4 shall be reduced by four feet.