Except for areas devoted to single-family and two-family dwellings, not less than 25% of the project area shall be landscaped, and not less than 15% shall be devoted to hard surfaced areas such as courtyards, plazas, and pedestrian walkways. If hard surfaced, the area must contain pedestrian amenities such as benches, courts, drinking fountains, planters, etc., and be separated from parking or maneuvering areas by tire stops, hedges, fences, or other devices. Landscaping must meet the standards in Article XVII, General Regulations.