On property located in the Class U-3 Commercial District, only the following signs are permitted:
(a) One advertising sign not to exceed six square feet as permitted by Section 1157.01(c)(1). No advertising sign shall be permitted until approved by the Architectural Board of Review pursuant to Chapter 1313 of the Building and Housing Code.
(b) The signs permitted in Section 1167.02 but only in compliance with the provisions of Section 1167.02.