A. 
The height limitations of this chapter shall not apply to:
(1) 
Chimneys, flues, spires or belfries.
(2) 
Elevator or stair bulkheads, roof water tanks or cooling towers, including enclosures, provided that such structures, in the aggregate, do not occupy more than 10% of the roof area.
(3) 
Flagpoles, radio or television antennas, masts or aerials, located on a building and extending not more than 20 feet above the roof of such building.