Certain commercial use of public sidewalks: any proprietor of an establishment in those areas of the city that are zoned C-3 Commercial District that sells food for consumption on or off the premises of such establishment may use that portion of the public sidewalk that is immediately adjacent to and that lies in between the side property lines, as extended to the curb, of the public sidewalk for the purposes of providing tables, chairs and/or benches, for the convenience of and use by such proprietor’s customers and others, with restrictions.