The sign regulations of the underlying districts in the Special West Chelsea District shall not apply to signs located within 50 feet of the High Line, except for signs located entirely below the level of the High Line bed. In lieu thereof, the sign regulations of a C1 District shall apply, except that accessory signs located within the High Line frontage may have a maximum height of 20 feet above the level of the High Line bed.

No signs affixed to or resting upon the High Line shall be permitted, except as pursuant to a signage plan for the High Line, as authorized by the City Planning Commission, provided the Commission finds that such signage plan will:

(a)        enhance the use of the High Line by providing signage that is consistent with the use of the High Line as a public open space;

(b)        provide, at a minimum, directional, informational and interpretive signage consistent with the use of the High Line as a public open space;

(c)        be integrated with the design of the High Line open space; and

(d)        not adversely affect development adjacent to the High Line and in the surrounding neighborhood.