Building setbacks along railroad rights-of-way

For all developments on zoning lots immediately adjacent or directly opposite to the Staten Island Rapid Transit right-of-way, a building setback of at least 20 feet in depth, unobstructed from its lowest level to the sky, except as permitted herein, shall be provided along the lot line adjacent to or directly opposite the right-of-way of such railroad. Such building setback shall be measured perpendicular to such lot line, as indicated on the District Map. Within such building setback area, there shall be provided one tree of three-inch caliper or more, pre-existing or newly planted, for each 400 square feet of such open area. The trees shall be selected in accordance with the table set forth in Appendix B.