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Accessory structures are those man-made structures on the landscape surrounding a primary structure that are mostly separated from the structure and usually not substantially connected to it, if connected at all. This includes storage or specialized buildings such as sheds, gazebos, and pet houses; border structures such as fences, retaining walls, and landscape timbers or railroad ties; and decorative or specialized structures such as trellises, pergolas and arbors, playsets, and outdoor furniture. They are smaller than the main structure and have specific functions. Accessory structures are made from the same wide variety of materials and combinations as fences.