 As the guest wings of the Wright building were only three stories tall, it actually had relatively few guest rooms.Once the war damage had been repaired, a new annex was constructed directly behind the North wing of Wright's building, opening on 1 December 1954 and adding 200 guest rooms to the hotel.Construction for a second annex of 450 guest rooms started on 17 November 1956, with the annex opening in June 1958.