At 1,670 feet, the Taipei 101 Tower in Taipei, Taiwan is currently the world's tallest building. Freedom Tower at the new World Trade Center in New York City is expected to rise 1,776 feet tall, including its enormous spire. (note the coincendence in height/year
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However, if you count non-habitable space, I suppose you guys in Canada have it, with the CN Tower at 1,815 ft.
Also, I think someone on this message board mentioned it once, Samsung is scheduled to build an even taller building than the Freedom Tower which has yet to be completed. This tower in Dubai is expected to be 800 meters tall, or, 2624 feet.
