Height limitations set forth in this Title shall not apply to church spires, belfries, cupolas and domes, water towers, fire and hose towers, observation towers, distribution and transmission lines, antennas, towers and poles, windmills, chimneys, smokestacks, flagpoles, radio towers, masts, aerials, and parapet walls; provided, that the building element does not extend more than four feet (4') above the limiting height of the building.