New York City Hall stands as a historic landmark and the oldest city hall in the United States that still serves its original governmental functions. Constructed between 1803 and 1812, it not only houses the office of the Mayor of New York City but also the chambers of the New York City Council. The building's architecture is a fine example of French Renaissance Revival on the exterior and Georgian Revival inside. It has been designated as a National Historic Landmark and is listed on the National Register of Historic Places, reflecting its significance in American history.