Notwithstanding any provisions to the contrary contained in this chapter, or subsequent amendments thereto, any lot in a Residence R-1A, R-1B or R-1C District having a street frontage of not less than 50 feet, and a depth of not less than 80 feet, as shown on the records of Passaic County prior to September 15, 1958, may be used for a dwelling and an accessory building, provided that the side, front and rear yards are at least as wide as the side, front and rear yards on the lots adjoining on each side, and provided further that no wall of any dwelling shall be nearer to the side line than five feet, nor nearer than 10 feet to the wall of a dwelling on an adjoining lot, and no wall of any accessory building on an inside lot shall be nearer than three feet to the side line or rear line, and no wall nor any dwelling or accessory building on a corner lot shall be nearer than 10 feet to the side street property line.