Church spires, domes, flagpoles, aerials, windmills, chimneys, cooling towers, elevator bulkheads, fire towers, belfries, monuments, stacks, derricks, conveyors, stage towers, scenery, lofts, tanks, water towers, silos or other appurtenances usually required to be placed above the roof level and not intended for human occupancy, may be erected to any lawful and safe height as determined by the Fire Chief and approved by the Planning and Zoning Commission.