N.J. Stat. § 40:61-13
When a park or public place, the title of which is in trustees, is within the corporate limits of a municipality, the governing body of such municipality may enter into an agreement with such trustees, as a consideration in whole or in part for a conveyance of the park to the municipality, providing for the expenditure of not less than a designated sum annually for the maintenance, upkeep and improvement thereof, to be specified in such agreement, as arranged upon between the parties, and thereupon accept a conveyance of such park subject to the conditions under which such trustees hold the same, provided such trustees have power to make such conveyance.
After the making of such conveyance the agreement shall continue to be binding upon the municipality and may be enforced by appropriate civil action or proceeding in lieu of prerogative writ instituted by any of the grantors in the deed, or their heirs or legal representatives or of any taxpayer resident in the municipality.
N.J.S. § 40:61-13