No structure shall be erected, converted, enlarged, reconstructed or structually altered to exceed the height limit hereinafter established for the district in which the structure is located, except that:
(a) Roof structures for the housing of elevators, stairways, tanks, ventilating fans or similar equipment required to operate and maintain the building, and fire or parapet walls, skylights, towers, steeples, stage lofts and screens, chimneys, smokestacks, water tanks or similar structures may be erected to exceed by not more than fifteen feet the height limits of the district in which it is located; provided that such structure shall not have a total area greater than twenty percent (20%) of the roof area of the building and shall not be used for any residential purposes;
(b) Radio, television and wireless aerials, or masts and flagpoles may be erected to any height.
(Ord. 18-90. Passed 6-26-90.)