The Stephen A. Schwarzman Building of the New York Public Library, originally called the Central Building and more widely known as the Main Branch or as the New York Public Library, is the flagship building in the New York Public Library system and a prominent historic landmark in Midtown Manhattan. The branch, opened in 1911, is one of four research libraries in the library system. It currently contains area of 646,680 square feet and 4 stories open to public.