In the industrial zone, supermarkets, lumberyards, department, variety, major appliance and furniture stores, garden centers, multi-office buildings or complexes and professional office centers, laboratories, industrial and manufacturing or processing plants, wholesale distribution centers and warehouses, construction enterprises, metalworking enterprises and/or similar uses: Each use may have one illuminated or non-illuminated sign displaying the name of the use attached flat against the front of the building, not exceeding an area equivalent to 5% of the front of the building or 100 square feet, whichever is smaller. Where the building(s) is designed for rear or side entrance, one sign may be attached flat against the building at the rear and side entrances, each sign not to exceed an area equivalent to half that of the sign on the front of the building. Except within residential districts or whenever such use is located within a planned shopping center and where such use is located on premises situate on and having at least 200 feet of unbroken frontage, said use may have one freestanding sign on each street frontage, provided that such sign shall not exceed 20 feet in height and shall not be larger than 40 square feet in area. No such freestanding sign shall be located closer than 100 feet to any residential district or property line of a property used for residential purposes or be closer than 15 feet to any street or road right-of-way. No building-mounted sign shall be higher than the roofline.