N.J. Stat. § 40:63-92
If in any case the contracting municipalities shall be unable to agree with the owner or owners of any rights of way, lands or real estate, rights or easements, deemed necessary by the joint meeting of the contracting municipalities for the making of any such public improvement as is hereby authorized and is provided for in the contract between them, or when by reason of legal or other incapacity or absence of the owner or owners or otherwise, no agreement can be made for the purchase thereof, the rights of way, lands or real estate, rights or easements therein, so deemed necessary for the purposes aforesaid, may be acquired by the contracting municipalities by condemnation in their joint names upon their joint application, in the manner now or hereafter provided by the general laws of this state relating to the condemnation of lands for public uses.
N.J.S. § 40:63-92