§ 8107-35.3.1. For properties located in the Open Space (O-S) zone, roofed structures shall be limited to a total maximum area of five hundred (500) square feet per acre, but not to exceed twenty-five thousand (25,000) square feet per site. Types of roofed structures allowed are limited to information centers/kiosks, administrative offices, restrooms, a gift shop, and maintenance/storage facilities. Greenhouses and hothouses are specifically exempted from the square footage limitation.