Structures, such as, but not limited to, television and radio towers, monuments, tanks, water and fire towers, ornamental towers and spires, chimneys, silos, elevator bulkheads, conveyors and flagpoles, may exceed the height regulation herein prescribed, provided that each required front, side and rear yard shall be increased by one foot for each foot of additional height above 35 feet and that the height of such structures will not constitute a hazard. The Allegheny County Airport Zoning Committee shall be consulted and a permit secured, if applicable.