Located at 1600 Pennsylvania Avenue, Washington, D.C., the White House has been at the heart of American history for over two centuries and today is one of the most recognizable buildings in the world. It is a grand mansion in the neoclassical Federal style, with details that echo classical Greek Ionic architecture. The architects original design was modeled after the Leinster House in Dublin, Ireland and did not include the north and south porticos. The White House has a total of six floors; a two-story basement, the Ground Floor, State Floor, Second Floor and Third Floor. There are 132 rooms, 35 bathrooms, and 6 levels in the White House. There are also 412 doors, 147 windows, 28 fireplaces, 8 staircases, and 3 elevators. The exterior of the White House was expanded to include two colonnades in 1801. Further additions include the South portico in 1824 and the North portico in 1829. Today, the porticos connect to the East and West Wings. The West Wing was added to the house in 1901, with the Oval Office added to the wing in 1909. The East Wing was added in 1942.