N.J. Stat. § 40:37-227
If at the expiration of three years no such redemption as is provided for in section 40:37-226 of this title is made, the commission shall, upon the surrender of the certificate of sale, execute and deliver to the purchaser, his legal representatives or assigns, a declaration of sale executed in the same manner as the certificate of sale. The declaration shall be duly proved or acknowledged and shall state briefly the facts of the assessment, advertisement and sale, giving a short description of the real estate sold, and the term for which it was sold. The declaration of sale shall be recorded in the books of the commission and also in the record of deeds in the office of the proper recording officer of the county, upon the payment of a fee of one dollar in each case. Until the recording of the declaration the time for redeeming such real estate shall remain open, notwithstanding the expiration of the said term.
N.J.S. § 40:37-227