2010 New York Code
RPP - Real Property
Article 9 - (290 - 336) RECORDING INSTRUMENTS AFFECTING REAL PROPERTY
321-A - Recording discharge of rent assignment.

§ 321-a. Recording discharge of rent assignment. An assignment of rent
  to accrue from real property, heretofore recorded, or hereafter recorded
  pursuant  to  section two hundred ninety-four-a of this chapter, must be
  discharged upon the record  thereof,  by  the  recording  officer,  upon
  presentation  to  him of a certificate signed by the assignee, or by his
  personal representative or his assignee, and acknowledged or proved  and
  certified  in  like  manner  to  entitle  a  conveyance  to be recorded,
  specifying that the obligation secured by the  assignment  of  rent  has
  been  satisfied  or  discharged,  or  that  the  assignment  of  rent is
  canceled. When so signed and acknowledged or proved and certified,  such
  certificate  may  be recorded, and such certificate, the record thereof,
  and a certified copy of such record may be introduced in evidence in all
  courts of this state. The certificate of discharge, and the certificates
  of its acknowledgment or proof,  must  be  recorded  and  filed;  and  a
  reference  must  be  made to the book and page containing such record in
  the minute of the discharge of such assignment  of  rent,  made  by  the
  officer upon the record thereof.  After such discharge has been recorded
  the  recording  officer  shall  make  and deliver to the person in whose
  interest such discharge of assignment of rent is executed and  recorded,
  his  certificate  setting  forth the names of the assignor and assignee,
  the liber and page at which, the time when such assignment of  rent  was
  recorded,  and  the  date on which said assignment of rent was satisfied
  and discharged.