The height limitations for the various districts shall not apply to spires, flagpoles, belfries, cupolas, noncommercial antennas, ventilators, chimneys or other appurtenances usually required to be placed above the roof level and not intended for human occupancy. The height limitations shall not apply to barns and silos provided that they are not located within 50 feet of any lot line. Town-owned elevated reservoirs, water tanks, fire or police training towers and standpipes are exempt from height restrictions. [Ord. 378 § 2 (Exh. 1), 1999.]