No building shall be erected closer than 50 feet to a public street (or right-of-way). No structure shall be closer to a property line than 50 feet, except that an accessory garage shall be no closer to a property line than 40 feet. Where adjoining one-family residential lots exist, or where the adjoining property is zoned for residential use, a buffer strip shall be maintained at the property line within the required setback area of at least 10 feet in width. This buffer strip shall be left in its natural state or planted to establish a visual screen in accordance with the recommendations of the Planning Board.