If it were me, I would start by just contacting someone via phone at the NYC Archives for some guidance.

-- ~Brian D. Kerr, Esq | SSG, U.S. Army (Retired) | SSA, Brigade G1, U.S. Army (Retired) |>>Known Family Surnames (Researching): Dessler, Walk(Valk), Mahler (Maler), Paradisgarten (Paradisegarten), Tomasy (Thomashy), Gluck, Preisz (Priess), Steinhardt (Steinhart), Grossman (Grosman), Sholtz (Shultz), Kaplan, Bloom, Fischer (Fisher), Levy, Baum, Duwidewic, Meisal (Maisel)<<|>>Known Family Locations/Regions (of Surnames): Poland, Ukraine, Russia, Hungary, Lithuania<<|