Government of The United States of America 1600 Pennsylvania Avenue NW Washington, DC 20500 - By the people and for the people.

The White House is located at 1600 Pennsylvania Avenue NW Washington, DC 20500. It has hosted the American public now for hundreds of years who annually take tours inside its halls. The residence was designed in a neoclassical style and its construction took place between 1792 and 1800. When Thomas Jefferson moved into the house in 1801 low colonnades on each wing that concealed stables and storage were added. Because of crowding within the executive mansion itself, President Theodore Roosevelt had all work offices relocated to the newly constructed West Wing in 1901. Eight years later in 1909, President William Howard Taft expanded the West Wing and created the first Oval Office, which was eventually moved as the section was expanded. In the main mansion, the third-floor attic was converted to living quarters in 1927 by augmenting the existing hip roof with long shed dormers. A newly constructed East Wing was used as a reception area for social events; Jefferson's colonnades connected the new wings. East Wing alterations were completed in 1946, creating additional office space. By 1948, the house's load-bearing exterior walls and internal wood beams were found to be close to failure. Under Harry S. Truman, the interior rooms were completely dismantled and a new internal load-bearing steel frame constructed inside the walls. Once this work was completed, the interior rooms were rebuilt. The modern-day White House complex includes the Executive Residence, West Wing, East Wing, the Eisenhower Executive Office Building—the former State Department. The Executive Residence is made up of six stories—the Ground Floor, State Floor, Second Floor, and Third Floor, as well as a two-story basement.