N.J. Stat. § 46:9-7
A covenant in any mortgage in the words, "That the mortgagor within (number to be inserted) days, upon written request of the holder thereof, will furnish at the expense of said holder a statement of the amount due on this mortgage", shall be construed to have the same force and effect as the following words:
"The mortgagor and any subsequent owner of the premises herein, upon written request served personally by the holder hereof, shall at the latter's expense certify to such person as the holder may designate, by writing duly acknowledged, the amount of principal and interest then owing on this mortgage, and whether any offsets or defenses exist against the mortgage debt; upon failure to furnish such certificate after the expiration of (number inserted) days, this mortgage shall, at the option of the holder hereof, become due and payable, anything herein contained to the contrary in anywise notwithstanding, provided said notice shall include a copy of this provision of this section."
N.J.S. § 46:9-7