Automobile, gas or service stations, car washing establishments and pubic garages, including the repair of motor vehicles, shall be a permitted use, provided that no use shall be located nearer than 25 feet to any residential zone, and provided further that no automobile, gas or service stations, car washing establishments and public garages shall be located within a radius of 1,000 feet of any existing automobile, gas or service stations, car washing establishments and public garages.