N.Y. Real Property Actions & Proceedings Law § 1607

§ 1607. Service of notice upon presumptive members of class. When an\ninterest in the affected real property has been limited to a class,\nservice of the notice of the application upon those persons in being who\nare the presumptive members of such class at the moment immediately\nbefore the application is made shall be sufficient service as to such\ninterest. If no such presumptive members of the class exist, the\nprovisions of section 1608 apply.\n