History of the world's tallest buildings
The buildings that were the tallest secular skyscrapers, which excludes religious buildings, were:
The list of tallest buildings is based on the default metric of the Council on Tall Buildings and Urban Habitat (CTBUH), that of measuring to the highest architectural element. Other criteria would generate a different list. Shanghai World Financial Center is not on the above list, but it surpassed Taipei 101 in 2008 to become the building with the highest occupied floor. Using the criteria of highest tip (including antennae), the World Trade Center in New York City was the world's tallest building from 1972 to 2000, until the Sears Tower in Chicago (which already had a higher occupied floor than the World Trade Center) had its antenna extended to give that building the world's tallest tip; a title it held until the 2010 completion of Burj Khalifa. Petronas Towers and Taipei 101 were never the world's tallest buildings by the highest–tip criteria.
First Canadian Place
First Canadian Place was the 6th tallest building in the world to structural top (currently 103rd) and the tallest building overall outside of Chicago and New York when built in 1975. It was also the tallest building in the Commonwealth of Nations until the completion of the Petronas Towers in Kuala Lumpur, Malaysia, in 1998. The Bank of Montreal "M-bar" logo at the top of the building was the highest sign in the world from 1975 until overtaken by the sign atop CITIC Plaza in 1997. The roof is still the location of a number of antennas used for radio and television broadcasting. The structure contains 29 elevators, and is one of only a few buildings in the world that uses the double-decked variety, and is connected to the underground PATH system.