Downing Street looking west. The Foreign and Commonwealth Office is on the left. The three adjoining houses 9–11 Downing St. are of dark brick, 11 having a white stucco ground floor. 12 Downing Street is the later-built red-brick building projecting forward from the line of the other three. The building on the near right is the Barry wing of the Cabinet Office, which has its main frontage on Whitehall.