N.J. Stat. Ann. § 52:27D-310.2

2. Notwithstanding any law or regulation to the contrary, nothing shall preclude a municipality which has reserved less than three percent of its land area for conservation, park lands or open space under the standards set forth in section 1 of this act from reserving up to three percent of its land area for those purposes. Nothing herein is intended to alter the responsibilities of municipalities with respect to plans already approved which were based upon the right to a vacant land adjustment.