The developed portion of the site which contains buildings, structures, equipment, storage areas and parking areas shall be screened by a buffer area as described in § 180-69 of this chapter for the distance necessary to screen the buildings, structures, equipment, storage areas and parking areas along any property line that adjoins property in an R-A, R-1, R-2 or R-3 District. In the case of a compressor station, buffer area "B" shall be required. In the case of a natural gas processing facility, buffer area "A" shall be required. If the developed portion of the site is fenced, the buffer area shall be located along the outside perimeter of the fence.