Lot designation. Every structure or group of structures and uses, including those of a public or institutional nature, and every cluster unit having services, facilities or utilities in common private usage and in common ownership or control by its occupants or which functions as an independent corporate property owner or agent of management shall be located upon and within a lot or plot of land, which shall be fully dimensioned and designated as representing the area of responsibility and extent of such individual or group ownership or management as may be established by ownership in full or partial fee or for lease under deed, covenant, lease contract or such other conditions of usage or occupancy legally established and recorded therefor, and a description or plan of each such lot or plat shall be filed separately or as part of the descriptive maps of a planned unit residential development with the Township Tax Assessor.