Rear yard: 10 feet, but not closer than five feet to the rear lot line. Notwithstanding the above, on lots with rear yards of 17 feet or less, a deck with a depth of 12 feet may be permitted, but not closer than two feet to the rear lot line, if such lot line abuts open space or an utility easement, not less than 10 feet in width. In addition, on lots with a minimum required side yard, not closer to that side lot line than a distance equal to such minimum required yard.