urban industrial sites, such as North False Creek and Coal Harbour, beginning in the mid-1980s. The result is a compact urban core that has gained international recognition for its "high amenity and 'livable' development". In 2006, the city launched a planning initiative entitled EcoDensity, with the stated goal of exploring ways in which "density, design, and land use can contribute to environmental sustainability, affordability, and livability". Architecture The Vancouver Art Gallery is housed downtown in the neoclassical former courthouse built in 1906. The courthouse building was designed by Francis Rattenbury, who also designed the British Columbia Parliament Buildings and the Empress Hotel in Victoria, and the lavishly decorated second Hotel Vancouver. The 556-room Hotel Vancouver, opened in 1939 and the third by that name, is across the street with its copper roof. The Gothic-style Christ Church Cathedral, across from the hotel, opened in 1894 and was declared a heritage building in 1976. There are several modern buildings in the downtown area, including the Harbour Centre, the Vancouver Law Courts and surrounding plaza known as Robson Square (designed by Arthur Erickson) and the Vancouver Library Square (designed by Moshe Safdie and DA Architects), reminiscent of the Colosseum in Rome, and the recently completed Woodward's building Redevelopment (designed by Henriquez Partners Architects). The original BC Hydro headquarters building (designed by Ron Thom and Ned Pratt) at Nelson and Burrard Streets is a modernist high-rise, now converted into the Electra condominia. Also notable is the "concrete waffle" of the MacMillan Bloedel building on the north-east corner of the Georgia and Thurlow intersection. A prominent addition to the city's landscape is the giant tent-frame Canada Place (designed by Zeidler Roberts Partnership Partnership, MCMP & DA Architects), the former Canada Pavilion from the 1986 World Exposition, which includes part of the Convention Centre, the Pan-Pacific Hotel, and a cruise ship terminal. Two modern buildings that define the southern skyline away from the downtown area are City Hall and the Centennial Pavilion of Vancouver General Hospital, both designed by Townley and Matheson in 1936 and 1958, respectively. A collection of Edwardian buildings in the city's old downtown core were, in their day, the tallest commercial buildings in the British Empire. These were, in succession, the Carter-Cotton Building (former home of The Province newspaper), the Dominion Building (1907) and the Sun Tower (1911), the former two at Cambie and Hastings Streets and the latter at Beatty and