(a)        Subarea A

At least 60 percent of the aggregate length of the eastern High Line frontage of a building shall set back at the level of the High Line bed. Not more than 40 percent of the aggregate length of such High Line frontage may rise above the level of the High Line bed. No portion of such High Line frontage shall exceed a maximum height of 20 feet above the level of the High Line bed, as illustrated in Diagram 2 (Street Wall and High Line Frontage Regulations in Subarea A) in Appendix C of this Chapter.

(b)        In C6-3A Districts and in Subareas C, F and G

For zoning lots extending less than 115 feet along the eastern side of the High Line, no portion of the eastern High Line frontage of a building shall exceed a height of 3 feet, 6 inches above the level of the High Line bed.

For zoning lots that extend for at least 115 feet along the eastern side of the High Line, no portion of the eastern High Line frontage of the building shall exceed a height of 3 feet, 6 inches above the level of the High Line bed, except that a maximum of 40 percent of such High Line frontage may rise without setback above a height of 3 feet, 6 inches above the level of the High Line bed provided such portion of the building is not located directly between the High Line and any street wall of a building that is subject to a maximum height of 45 feet in accordance with paragraph (c) (Subareas C, F and G) of Section 98-423 (Street wall location, minimum and maximum base heights and maximum building heights).

The portions of buildings in which High Line Service Facilities are provided in accordance with paragraph (b)(4) of Appendix E shall be considered permitted obstructions to the height and setback regulations of this paragraph (b).

However, the provisions of this paragraph (b) shall not apply to any zoning lot existing on June 23, 2005 where the greatest distance between the eastern side of the High Line and a lot line east of the High Line is 35 feet when measured parallel to the nearest narrow street line.