As used in this act:
"Manufactured home" also means and includes any unit of housing manufactured before the effective date of the standards promulgated by the secretary or, as appropriate, by the commissioner, but which otherwise meets the criteria set forth in this subsection;
A parcel, or any contiguous parcels, of land which contain, on the effective date of this act, no fewer than three sites equipped for the installation of manufactured homes, and which otherwise conform to the provisions of this subsection, shall qualify as a mobile home park for the purposes of this act;
N.J.S. § 54:4-1.4