N.J. Stat. § 40:60-36.2
In any municipality where lands have been conveyed to a municipality and no consideration has been paid therefor, with conditions, limitations and restrictions contained in such conveyance upon said lands to the effect that said lands shall be used for public or park purposes and prohibiting the municipality from erecting structures upon the same or from using said lands other than for public purposes, and providing that said lands shall revert to the grantor or his heirs or assigns upon breach of any of such conditions, whether said lands have been accepted by the municipality or not, the governing body at any time after five years from the date said lands were acquired, when no improvements upon, damages to or changes in said lands have been made, may cause to be put upon the ballots of any general election a question to determine whether or not the general public desire to retain said lands with said conditions, limitations and restrictions thereon.
N.J.S. § 40:60-36.2