Exterior public and semipublic spaces, such as courtyards or plazas, may be designed to enhance surrounding buildings and provide amenities for users, in the form of textured paving, landscaping lighting, street trees, benches, trash receptacles and other items of street furniture, as appropriate. Courtyards may have recognizable edges defined on at least three sides by buildings, walls, elements of landscaping, and elements of street furniture, in order to create a strong sense of enclosure. Use of recycled or "green" products are strongly encouraged where feasible.