(a) Institutional, industrial and apartment buildings with a height in excess of the maximum height specified in Sections 1125.01 and 1125.03 for such buildings may be permitted provided the required front, side and rear yards are increased by one foot for each foot of additional building height above the maximum specified in Sections 1125.01 and 1125.03, except that no building shall exceed a maximum height of 100 feet without prior approval of the Board of Zoning Appeals.
(b) The height regulations prescribed herein shall not apply to television and radio and communication towers, church spires, belfries, monuments, tanks, water and fire towers, stage towers or scenery lofts, cooling towers, ornamental towers and spires, chimneys, silos and similar structures, elevator bulkheads, smokestacks, conveyors and flagpoles, except where the height of such structures will constitute a hazard to the safe landing and take-off of aircraft at an established airport.