Height. The height limitations of this Chapter shall not apply to church spires, belfries, cupolas, and domes not used for human occupancy, nor to chimneys, ventilators, skylights, water tanks, similar features, and necessary mechanical appurtenances usually carried above the roof level. Such features, however, shall be erected only to such height as is necessary to accomplish the purpose they are to serve. The provisions of this Chapter shall not apply to prevent the erection above the building height limit of a parapet wall or cornice for ornament (and without windows) extending above such height limit not more than five (5') feet.