New York Consolidated Laws, Abandoned Property Law - ABP § 1220. Service

(a) by first class mail on all known respondents for whom there is a last known address;  and

(b) by publication on unknown respondents and known respondents for whom there is no last known address in the manner provided in subdivision two of section twelve hundred six of this chapter;  and

(c) by first class mail, together with a copy of the petition, on the clerk, registrar or other officer in charge of the agency, department, instrumentality or corporation having possession, custody or control of such property, together with a statement that no personal claim is made against him.