Built by Charles Langton Corwin for the First National Bank after the bank received the first national bank charter on Long Island in March 1864. The bank is one of the last original brick structures and the only original of its period in this sector of Main Street. The second story, side and rear sections were added between 1897 and 1909. The brackets are cast iron; sills and keystones are granite. The first drive-up teller window on Eastern Long Island was added in 1958.