On waterfront blocks, parking spaces accessory to residential uses may be located on the roof of a building, or portion thereof, that does not contain dwelling units or rooming units, provided that:

(a)        the roof level is not higher than 23 feet above the base plane;

(b)        the perimeter of the roof is enclosed by a four foot high parapet wall or other enclosure at least 50 percent opaque;

(c)        trees are provided in accordance with Section 62-655 (Planting and trees) at the rate of one tree for each 10 parking spaces for parking areas at grade;

(d)        if on the roof of a portion of a building containing dwelling units or rooming units, the sill level of any dwelling unit or rooming unit windows opening onto such roof area is at least 10 feet above the roof and no parking spaces or vehicular aisles are located within 10 feet of a wall with dwelling unit or rooming unit windows; and

(e)        no flood lighting shall be permitted and any lighting shall be directed away from any residential windows on the same or an adjacent zoning lot.