Located at 1600 Pennsylvania Avenue, Washington, D.C., the White House has been at the heart of American history for over two centuries & 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 architect's original design was modeled after the Leinster House in Dublin, Ireland & did not include the north & south porticos. The White House has a total of six floors; a two-story basement, the Ground Floor, State Floor, Second Floor & Third Floor. There are 132 rooms, 35 bathrooms, & 6 levels in the White House. There are also 412 doors, 147 windows, 28 fireplaces, 8 staircases, & 3 elevators. The exterior of the White House was expanded to include two colonnades in 1801. Further additions include the South portico in 1824 & the North portico in 1829. Today, the porticos connect to the East & 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.