Common property in the PUD is a parcel or parcels of land and a privately owned road or roads, together with the improvements thereon, the use and enjoyment of which are shared by the owners and occupants of the individual building sites. When common property exists, the ownership of such common property may be either public or private, at the option of the Town Board. When common property exists in private ownership, the owners shall grant such easements over, under and through such property to the Town as are required for public purposes. Also, satisfactory arrangements must be made for the improvement, operation and maintenance of such common property and facilities, including private streets, drives, service parking and recreational areas, pursuant to § 300-16.