§ 8109-3.3.2. Principal buildings constructed of metal shall be faced along any street side with masonry, stone, concrete or similar material, such facing treatment to extend along the interior side yards of such building a distance of at least ten feet. The metal portion of the principal building and all metal accessory buildings shall have exterior surfaces constructed or faced with a stainless steel, aluminum, painted, baked enamel, or similarly finished surface.

                    
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