Seventy-five (75%) percent of the gross floor area of any building in the Amboy Avenue Revitalization Zone may be used for residential purposes. One (1) residential unit shall be permitted on the first floor to meet ADA standards. The construction of any residential units within any mixed-use building shall be subject to the Affordable Housing Requirements set forth in subsection 37-15.7 in terms of the minimum number of affordable housing units that must be contained required.