N.J. Stat. Ann. § 27:16-48

The board of chosen freeholders may enter upon and take property for any of the purposes set forth in section 27:16-1 of this Title, in advance of making compensation therefor, in any case where it cannot acquire the property by agreement with the owner. In such cases the board, upon exercising such right and entering upon and taking the property in advance of making compensation therefor, shall institute an action to fix the compensation to be paid to the owner and others as provided in chapter one of Title 20 of the Revised Statutes.