A.

Single family detached or attached dwellings may be built on lots smaller than normally required. Lot sizes may be as small as twenty thousand (20,000) square feet per dwelling unit in an R40 district, ten thousand (10,000) square feet per dwelling unit in an R20 district and six thousand (6,000) square feet per dwelling in an R10 district. All other minimal dimensional requirements shall be the same as the district governing the smallest permitted lot size. For example, a cluster development in an or R40 district shall follow the minimum lot width, setback and lot coverage requirements of a conventional development in the R20 district, and a cluster development in an R20 district shall follow the minimal dimensional requirements of an R10 district as specified in section 32-77 of this ordinance.

B.

No dwelling in a cluster development shall be built vertically for more than one (1) family.

C.

Where lots on the outer perimeter of the proposed RCD are contiguous to developed residential building lots outside the RCD, or there are existing residential structures within one hundred (100) feet of the perimeter of the RCD, the lots on the perimeter of the RCD must comply with the rear yard setback required for the underlying zoning district in which the cluster is located. This dimensional requirement may also be met in the form of an easement or open space lot.