N.J. Stat. Ann. § 40:61-22.30

The body or authority having control of any public park, playground or other public place or property in any municipality may enter into an agreement with any person for the construction by said person of any facility within said public park, playground or other public place that said body or authority is itself authorized by any law to construct, subject to the approval by said body or authority of the plans, specifications and location of such facility, and may accept as a gift any such facility.