Patios and open decks are subject to the height, yard and setback requirements of the zone district for permitted principal uses. No patio, ground level deck, sidewalk, driveway, paved parking area or other impervious surface structure shall be located closer to a side or rear property line than 15 feet in the R-40 zone, 10 feet in the R-20 zone, five feet in the R-10 zone and three feet in the R-9 and R-7.5 zones.