In the C-M zone, buildings or structures having exterior walls of sheet metal shall not be located closer than one hundred fifty feet (150') from the property line along any freeway, major or secondary highway, or closer than one hundred feet (100') from the property line along any other dedicated street, except that such buildings or structures may be located closer to the street if any of the following conditions prevail:
A. The sheet metal comprises less than twenty five percent (25%) of the exterior wall area of the building or structure;
B. The sheet metal consists of panels with stainless steel, baked enamel or similar finish; or
C. The building or structure is concealed from view from the public street by walls, fences, landscaping or other buildings or structures. (Ord. 1000 § 27.40(L), 1955)