The Hull–Ottawa fire of 1900 destroyed two-thirds of Hull, including 40 percent of its residential buildings and most of its largest employers along the waterfront. It also spread across the Ottawa River and destroyed about one-fifth of Ottawa from the Lebreton Flats south to Booth Street and down to Dow's Lake. On 1 June 1912, the Grand Trunk Railway opened both the Château Laurier hotel and its neighbouring downtown Union Station. On 3 February 1916, the Centre Block of the Parliament buildings was destroyed by a fire. The House of Commons and Senate was temporarily relocated to the then recently constructed Victoria Memorial Museum, now the Canadian Museum of Nature until the completion of the new Centre Block in 1922, the centrepiece of which is a dominant Gothic revival styled structure known as the Peace Tower. The location of what is now Confederation Square was a former commercial district centrally located in a triangular area downtown surrounded by historically significant heritage buildings which includes the Parliament buildings. It was redeveloped as a ceremonial centre in 1938 as part of the City Beautiful Movement and became the site of the National War Memorial in 1939 and designated a National Historic Site in 1984. A new Central Post Office (now the Privy Council of Canada) was constructed in 1939 beside the War Memorial because the original post office building on the proposed Confederation Square grounds had to be demolished.