N.J. Stat. Ann. § 27:7-44.4

Such additional unimproved lands may be acquired in tracts sufficiently large to permit the laying out of sites for the relocation thereon of more than one structure or structures or may be acquired in individual sites for the relocation thereon of one structure; provided, however, that no structure or structures shall be relocated upon any site until a plan or plans therefor shall have first been prepared at the behest of the State Highway Commissioner and approved by him.