The provisions of Section 42-533 (Illuminated or flashing signs) shall be modified to allow one accessory non-flashing illuminated sign to have a surface area of 750 square feet in each of the following Subareas: the Navy Street Central Subarea, the Flushing East Subarea, between Clinton Avenue and Washington Avenue, the Barge Basin East Subarea, and the Barge Basin West Subarea. All other illuminated signs shall comply with the requirements of Section 42-533 (Illuminated or flashing signs).