The following building materials, and none others, shall be allowed in the construction of the exterior walls of buildings and structures constructed and installed in a C-3 highway business district in the city:

    A.    The exterior walls of a building or structure that faces the street or front lot line of the building lot (the "front wall") shall be constructed of one or more of the following building materials: (a) any building materials allowed for front walls of buildings or structures in a C-2 general business district in the city; (b) architectural cement blocks; (c) stucco.

    B.    All exterior walls other than the front wall of buildings or structures shall be constructed of one or more of the following building materials: (a) the building materials authorized for walls other than front walls in a C-2 general business district; (b) nonvertical metal, vertical metal not to exceed fifty (50) percent of the height of each wall, vinyl and/or wood siding; and (c) architectural or regular cement blocks. (Ord. 1907 § 2, 2001; Ord. 1525 § 2 1996: prior code § 40-7-3(I))