Accessory structures shall be limited to not more than three hundred (300) square feet in total floor area. Accessory structures shall comply with the elevation requirements and other requirements of Section 32-208 of the County Code or, if not elevated, shall: Be useable only for parking of vehicles or limited storage; Be constructed with flood damage-resistant materials below the base flood elevation; Be constructed and placed to offer the minimum resistance to the flow of floodwaters; Be anchored to prevent flotation; Have electrical service and mechanical equipment elevated to or above the base flood elevation; and If larger than one hundred (100) square feet in size, have walls that meet the requirements of Section 32-208, as applicable for the flood zone; and if located in Coastal A Zones, walls shall have flood openings that meet the requirements of Section 32-207.