10.11.1 Signs that were lawful as of the effective date of this Code but are not in conformance with current requirements shall be permitted to be maintained as nonconforming signs, except as provided below:
a. The signs and supporting structures may not be enlarged, moved to a different location in the City unless that location conforms to all applicable provisons of this ordinance, or improved through replacement by substantially different materials or in any other manner, except that a non-conforming billboard may be replaced by an electronic graphic display type billboard subject to the standards in Sections 18.104.22.168 and 10.7.2. (12);
b. Lights and/or other electric or electronic features may not be added, and the intensity of lighting may not be increased, except for billboard replacement as provided in Section 10.11.1. (a).