A. No land, building, structure, part thereof, or obstruction shall be established or changed in any of the airport zones unless a permit therefor has been obtained from the Zoning Administrator.
B. Within the horizontal and conical zones, a permit shall not be required for any building, structure, part thereof or obstruction less than 75 feet in height, provided that such building, structure, part thereof or obstruction does not exceed the height limitations as prescribed hereinbefore.
C. Within the approach zones, and at a horizontal distance not less than 4,200 feet from each end of a runway, a permit shall not be required for any building, structure, part thereof or obstruction less than 75 feet in height, provided that such building, structure, part thereof or obstruction does not exceed the height limitations as prescribed hereinbefore.
D. Within the transition zones beyond the perimeter of the horizontal zone, a permit shall not be required for any building, structure, part thereof or obstruction less than 75 feet in height, provided that such building, structure, part thereof or obstruction does not exceed above the height limitations as prescribed hereinbefore.