Not less than one amenity shall be included as part of each mixed-use development containing residential units. Amenities may include area features such as barbeques, community gardens, dining furniture, pet exercise areas, pet washes, fire pits, fireplaces, game courts, gymnasiums, playground equipment, putting greens, saunas, sitting areas, swimming pools and/or spas, tot lot, and other amenities as determined acceptable by the Director of Community Development.