New York Laws
Article 5 - Adverse Possession
521 - Adverse Possession Not Under Written Instrument or Judgment.

ยง 521. Adverse possession not under written instrument or judgment.
Where there has been an actual continued occupation of premises under a
claim of right, exclusive of any other right, but not founded upon a
written instrument or a judgment or decree, the premises so actually
occupied, and no others, are deemed to have been held adversely.