Helistops shall only permitted in CCD and Agricultural District. The following regulations shall apply to helistops:
(a) Fueling, maintenance or overhaul of aircraft at a helistop is prohibited.
(b) In addition to aviation and structural requirements which may be imposed by the proper authorities, helistops, where permitted, shall comply with the following requirements:
(1) A minimum unobstructed landing area shall not be less than 125 X 125 feet when located on the ground and not less than 40 X 40 feet when located on a rooftop.
(2) No landing area shall be developed or shall continue to be used within a horizontal distance of 200 feet from any other district.