(1) No more than 50% of any exterior wall of a Commercial Building exterior can be metal except as provided in (3) below.

(2) At least 50% of the Primary Façade of any Commercial Building must be masonry. All other Façades of the Building must be 35% masonry. For the purposes of this section, masonry shall include stucco, stone, brick and concrete block. Unfinished or gray concrete block is excluded.

(3) Commercial Buildings that exceed the Building relief, Building design and roof treatment minimum standards listed below by at least one treatment per section may use more than 50% metal or less than required masonry.