2006 New York Code - When Future Estates Are Defeated

 
  § 6-5.10 When future estates are defeated
    A  future  estate  cannot  be defeated or barred by any disposition or
  other act of the owner of the precedent estate, nor by  the  destruction
  of  such precedent estate by disseizen, forfeiture, surrender, merger or
  otherwise; but a future estate may be defeated in any manner  which  the
  creator has provided.