For large-scale general developments within the Hallets Point Peninsula in Community District 1, in the Borough of Queens, floor area shall not include floor space used for off-street parking spaces provided in any story located not more than 33 feet above the base plane, provided that where such facilities front upon streets and waterfront public access areas, such spaces are within facilities that are located behind commercial, community facility or residential floor space so that no portion of such parking facility, other than entrances and exits, is visible from such street or waterfront public access areas. Such floor space shall have a minimum depth of 18 feet.