<P> The West Wing of the White House, also known as the Executive Office Building, houses the offices of the President of the United States . The West Wing contains the Oval Office, the Cabinet Room, the Situation Room, and the Roosevelt Room . </P> <P> The West Wing's seven floors contain offices for the White House Chief of Staff, the Counselor to the President, the Senior Advisor to the President, the White House Press Secretary, and their support staffs . The Vice President--whose primary office is next door in the Eisenhower Executive Office Building--also has an office in the building . Adjoining the press secretary's office, in the colonnade between the West Wing and the Executive Residence is the James S. Brady Press Briefing Room along with work space for the White House press corps . </P> <P> Before construction of the West Wing, presidential staff worked on the second floor of what is now the Executive Residence . However, when Theodore Roosevelt became president, he found that the existing offices in the mansion were insufficient to accommodate his family of six children as well as his staff . </P>

Who built the west wing of the white house