If a building contains more than one establishment, the signs permitted in Subsection B(2), (3) and (4) above shall be uniform in terms of design, colors, height of background, style and height of lettering and position on the building wall. In the case of a new sign for an individual establishment in a preexisting, multi-use building, the new sign shall be consistent with the design of existing signs where a uniform pattern has been established. If no uniform pattern has been established, the new sign shall, to the greatest extent possible, follow the pattern of the existing sign or signs which most closely fulfill the objectives of these regulations. The owner, as well as individual tenants, of a multi-use building shall be responsible for compliance with these regulations.