N.Y. Real Property Actions & Proceedings Law § 904: Permissible defendants

§ 904. Permissible defendants. The plaintiff, at his election, may

make defendant in the action:

1. A tenant by the curtesy or for life or for years, of the entire

property, or whoever may be entitled to a contingent or vested remainder

or reversion in the entire property, or a person having a lien or

interest which attaches to the entire property. A person specified in

this subdivision who is not made a party is not affected by the judgment

in the action.

2. A person having a lien on an undivided share or interest in the

property. The nature of the lien and the share or interest to which it

attaches shall be specified.

3. An unknown person entitled to an estate or interest in the property

sold. The court shall provide for the protection of his rights, as far

as may be, as if he were known and had appeared.

4. The state.