The provision of Sections 17.54.230 through 17.54.270 shall not apply to:

    A.    Flags of any nation, state, county, city or other governmental unit and any not-for-profit organization;

    B.    Real estate signs not exceeding six square feet in area, which advertise the sale, rental or lease of the premises upon which said signs are located only. These signs shall be removed within five days following the sale or lease of the property being advertised for sale or lease;

    C.    Memorial signs or tablets, names of buildings and date of erection when cut into any masonry surface or when constructed of bronze or other incombustible materials;

    D.    Signs erected inside a building not visible through windows. (Ord. 1743 § 1 (part), 1999)