(a) An applicant may propose to include a ratio of not less than seventy-five (75) percent from the list of the permitted or conditional uses for the underlying zoning district, and not more than twenty-five (25) percent from the list of the permitted or conditional uses from any other zoning district except those uses listed in the "M" districts.
(b) Combinations of residential types may be proposed to allow greater design flexibility. This combination of residential types may include single-family detached dwellings, two-family dwellings, zero lot line units, and multiple-family dwellings.