The West Wing
The West Wing is the building housing the official offices of the President of the United States. It is the part of the White House Complex in which the Oval Office, the Cabinet Room, the Situation Room, and the Roosevelt Room are located. Besides serving as the day-to-day office of the President of the United States, the three floors of the West Wing include offices for senior members of the Executive Office of the President of the United States and their support staff. The West Wing is located directly west of the Executive Residence and is largely concealed from view by trees because its height is lower than that of the main structure.
The West Wing ground floor is also the site of a cafeteria, staffed by Naval culinary specialists and called the White House mess. It is located underneath the Oval Office, and was established by President Truman on June 11, 1951. As of 2009, the mess is open daily from 7 am to 8 pm.