One Canada Square was completed. It is expected to become the third tallest building in the United Kingdom in 2019 upon completion of 22 Bishopsgate. One Canada Square never achieved the title as tallest skyscraper in the European Union because in accordance to the CTBUH method, a building has to be "completed" before its receives its title, with Messeturm in Frankfurt being completed in 1990. On 15 November 1992, the Provisional Irish Republican Army attempted to place a large improvised explosive device near the tower. The IRA had already worked out that to cause maximum damage, the bomb had to be placed under
Canada House future Macdonald House, located at 1 Grosvenor Square in Mayfair, in 1961. In 1993, Canada House was closed by the Canadian government as a cost-cutting measure with the intention of selling it. A change of government in Canada saw this decision reversed and renovations were planned instead, beginning in 1997. The building was officially reopened by Queen Elizabeth II, as Queen of Canada, in May 1998. To commemorate the reopening, a detachment from the 3rd Battalion, Princess Patricia's Canadian Light Infantry, came to London and mounted the Queen's Guard at Buckingham Palace. Canada House was closed again in 2010 and