Garden apartments and hotel and motel buildings shall be set back from all street lines a minimum of 50 feet, except that none shall be erected or constructed within 75 feet of any R-1, R-2 or R-3 District lines. Garden apartments shall be constructed on lots a minimum of 200 feet in width at the street line and a minimum lot area of five acres and shall more particularly conform to the additional standards as set forth under §§ 236-35 through 236-42 of this chapter.