In any commercial zoning district where no increase in lot yield
or density is provided, and residential development of five or more
dwelling units are proposed for construction, including mixed-use
buildings, an applicant shall be required to set-aside and establish,
as a condition of subdivision, resubdivision, or site plan approval,
one affordable dwelling unit for each group of five market rate dwelling
units proposed for construction, whether owner-occupied or rental
units. All of the affordable housing shall be provided on-site.