N.Y. Est. Powers & Trusts Law § 6-2.1

§ 6-2.1 Estates in severalty, joint tenancy, tenancy by the entirety and\n in common\n Estates as to the number of persons owning an interest therein are\nclassified as follows:\n (1) In severalty.\n (2) Joint tenancy.\n (3) Tenancy in common.\n (4) Only as to real property and, on and after January first, nineteen\nhundred ninety-six, as to the shares of stock of a cooperative apartment\ncorporation allocated to an apartment or unit together with the\nappurtenant proprietary lease, tenancy by the entirety.\n