N.J. Stat. § 32:16-6
When the lands or rights in lands which the Palisades Interstate Park Commission seeks to obtain for the parkway cannot be acquired by agreement with the owner thereof, because of a disagreement as to the price to be paid, the legal incapacity or absence of the owner, or his inability to convey valid title thereto, or for any other cause, the commission may enter upon and take any of such property in advance of making compensation therefor. In any such case, the commission, upon exercising this right and entering upon and taking lands shall proceed without undue delay to condemn the lands so entered upon in the manner prescribed by section 32:16-5 of this Title; and, in any such case the amount of the judgment in the action shall bear interest from the date of the entry by the commission to the date of the payment of the award to the owner or into the court, as the case may be.
N.J.S. § 32:16-6