The bulk regulations of the underlying districts shall apply, except as superseded, supplemented or modified by the provisions of this Section, inclusive.

In addition, for developments or enlargements on qualifying transit improvement sites, a floor area bonus for mass transit station improvements may be granted by the City Planning Commission pursuant to the provisions of Section 66-51 (Additional Floor Area for Mass Transit Station Improvements). For the purposes of this paragraph, defined terms additionally include those in Section 66-11 (Definitions).