No certificate presented to the recording officer shall purport to discharge more than one mortgage, except that one certificate may purport to discharge two or more mortgages where the certificate states that one of such mortgages corrects, perfects or modifies the other mortgage or mortgages, or spreads the lien of the other mortgage or mortgages over the property subject to the lien of such mortgage, or consolidates the lien of the other mortgage or mortgages with the lien of such mortgage to constitute a single lien, or where the certificate states that the liens of the mortgages which the certificate purports to discharge have been so spread or so consolidated by a separate instrument and such instrument has been recorded; provided that in such case the certificate of discharge shall identify and describe each mortgage which it purports to discharge, in a separate paragraph, in the same manner and with the same particularity, and setting forth the same information with respect to assignments thereof, as would be required for a separate certificate discharging that mortgage, and shall also state, in a separate paragraph for each instrument, the date of any such separate instrument by which the liens of the mortgages have been spread or consolidated, the names of the parties thereto, and the book and page where it has been recorded or the serial number of such record. In any such case, except where otherwise expressly provided by law, the fee or fees which the recording officer is entitled to receive for filing and entering a certificate of discharge of a mortgage and examining assignments of such mortgage shall be payable with respect to each mortgage which the certificate purports to discharge, to the same extent as if a separate certificate of discharge had been filed for such mortgage.
N.Y. Real Prop. Law § 321