2010 New York Code
CVP - Civil Practice Law & Rules
Article 31 - (3101 - 3140) DISCLOSURE
R3118 - Demand for address of party or of person who possessed an assigned cause of action or defense.

Rule  3118.  Demand for address of party or of person who possessed an
  assigned cause of action or defense. A party may serve on  any  party  a
  written  notice  demanding  a  verified statement setting forth the post
  office address and residence of the party, of any specified  officer  or
  member of the party and of any person who possessed a cause of action or
  defense asserted in the action which has been assigned. The demand shall
  be complied with within ten days of its service.

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