The height limitations of this chapter shall not apply to silos, church spires, belfries, cupolas, and domes not used for human occupancy.

Chimneys, ventilators, skylights, water tanks and similar features, and necessary mechanical appurtenances usually carried on and above the roof level may exceed the height limitation of this chapter by not more than 15 feet. If such equipment is construed as a secondary structure, apart from the primary structure, the height restriction of this chapter shall apply.

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. Public and quasi-public buildings, schools, churches and other similar permitted uses shall increase the front, rear and side yards by one foot for each foot by which such building exceeds the height limit herein established for such zone in which it is located, and further provided that in no case shall any building have a height greater than 50 feet unless explicitly permitted by the schedule of this chapter.