The special yard provisions of 62-332 (Rear yards and waterfront yards) shall apply, except the 40 foot minimum depth requirement for a waterfront yard may be reduced by up to five feet, to a minimum depth of 35 feet, along those portions of the landward edge of the stabilized shore, bulkhead or natural shoreline where the depth of the landward portions of the zoning lot is less than 150 feet, as measured perpendicular and landward from such edge.