The New York Stock Exchange Building is the headquarters of the New York Stock Exchange (NYSE), located in the Financial District of Lower Manhattan in New York City. It is composed of two connected structures occupying much of the city block bounded by Wall Street, Broad Street, New Street, and Exchange Place. The central section of the block contains the original structure at 18 Broad Street, designed in the Classical Revival style by George B. Post. The northern section contains a 23-story office annex at 11 Wall Street, designed by Trowbridge & Livingston in a similar style.