A height not exceeding 65 feet with a maximum of five stories above grade may be permitted if there is a 5% increase of green space, beyond the minimum of 20% as per § 311.C-22D(8), for a total of 25% green space, and the 5% increased green space area shall include benches, planters with landscaping, arbors, pergolas, a roof garden with swimming pool, ornamental street lights, hanging baskets, bicycle racks, and decorative sidewalk materials.