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