A. Towers, gables, scenery lofts, cupolas, water tanks, mechanical appurtenances and similar structures may be erected on a building to a height greater than the limit established in any district; provided, that all such exceptions shall cover no more than fifteen (15) percent of the area of the building.

B. Chimneys, water tanks, civil defense sirens, flag poles, monuments, radio or TV antennas, government or public utility structures and similar freestanding structures may be erected to a height greater than the limit established by any zoning district; provided, the total of such exceptions on any one lot shall not exceed fifteen (15) percent of the site.