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, fire towers, bulkheads, and similar features; nor to silos and other farm buildings and structures; not to any accessory mechanical appurtenances usually carried above the roof level.

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 feet.