N.Y. Real Property Law § 418: Assignment of mortgage, lease, or other lien or charge

§ 418. Assignment of mortgage, lease, or other lien or charge. The

holder of any mortgage, lease, or other lien or charge on registered

property, in order to transfer the same or any part thereof, shall

execute an assignment of the whole or any part thereof; and upon such

assignment being filed in the office of the registrar, the registrar

shall enter in the title book a memorial of such transfer with a

reference to the assignment by its file number; he shall also note upon

the instrument on file in his office intended to be transferred, and

upon the registration copy thereof produced, the number of the

certificate on which the memorial is entered, with the date of the

entry.