In addition to the general development standards described in Section 1135.04, residential OSDs shall meet the following development standards:
(a) Clustering Residential Development and Required Open Space. Clustering residential density is encouraged to provide required common open space. A minimum of twenty percent (20%) of the land developed for residential purposes in a OSD-RS project shall be reserved for common open space. This required amount of common space shall be established as common open space, under one ownership, and provisions shall be established for maintenance and care. The legal articles relating to any organization of property owners in the development charged with such open space maintenance shall be submitted to the Village. The Village Council may require as a condition of final approval, any evidence deemed necessary to document that the required common space will remain in its stated condition as long as the development exists (including such as legal documents as deed restrictions, conservation easements, etc.).
(b) Clustering Residential Density. To achieve a clustering of residential density and to provide for the required common open space, the lot area requirements for residential land uses may be reduced from the densities required under the district(s) applying to the property at the time of application, by up to twenty percent (20%). The lot width, and yard requirements for residential lots may be also be reduced as needed to accommodate a variety of structural patterns, clustering designs and housing types.
(c) Residential Dwelling Types. Along with clustering residential density, a OSD-RS may include a mixture of dwelling types, including, single-family detached dwellings, two-family units, zero lot line units, and multi-family units, provided the maximum densities defined in each existing zoning classification is not exceeded.