(a) The following may exceed the maximum height regulations when erected in accordance with all other laws of the City: chimneys, cooling towers, elevator bulkheads, fire towers, gas tanks, lighthouses, solariums, steeples, penthouses, stacks, stage towers or scenery lofts, tanks, water towers, ornamental towers and spires, wireless, television or radio towers and necessary mechanical appurtenances.
(b) Public, semipublic or public service buildings, hospitals, institutions or schools, where permitted, may be erected to a height not exceeding sixty feet and churches and temples may be erected to a height not exceeding seventy-five feet when the required side and rear yards are each increased by one foot for each foot of additional building height above the height regulations for the district in which the building is located.