N.J. Stat. Ann. § 32:9-5

If the compensation to be paid for such properties shall not be agreed upon, the joint commission, having given at least sixty days' notice to the owners of the lands and parties in interest of its intention so to do, shall enter upon and take possession of the lands in the name of this state. Such entry and possession shall entitle the joint commission to the exclusive use and right of possession of the property for the purposes set forth in this chapter.