Roof signs are allowed:in a residential use category, only on multi-family dwellings with 100 or more units; in all other use categories, on all uses for which the sign is otherwise allowed under this title; in the zoning districts specified in this title or in <em>Table 17-201: Sign Regulations</em>. The roof sign may be located on the side of a roof structure that forms a backdrop for the sign. The maximum size of a roof sign is determined by:measuring the building frontage along the lot line of the elevation on which the roof sign will be placed; and applying to that measurement the area factor specified in <em>Table 17-201: Sign Regulations</em>. The size of a roof sign on each side of the building is limited to the square footage calculated on that side only. In no case may the square footage allowed by the building frontage located along any lot line be combined with the square footage allowed by the building frontage located along any other lot line to create a larger sign on a building other than that allowed on each individual building elevation. Ord.18-216 Ord. 22-181