CN Tower
"Guinness World Records" has called the CN Tower "the world's tallest self-supporting tower" and "the world's tallest free-standing tower". Although Guinness did list this description of the CN Tower under the heading "tallest building" at least once, it has also listed it under "tallest tower", omitting it from its list of "tallest buildings." In 1996, Guinness changed the tower's classification to "World's Tallest Building and Freestanding Structure". Emporis and the Council on Tall Buildings and Urban Habitat both listed the CN Tower as the world's tallest free-standing structure on land, and specifically state that the CN Tower is not a true building, thereby awarding the title of world's tallest building to Taipei 101, which is shorter than the CN Tower. The issue of what was tallest became moot when Burj Khalifa, then under construction, exceeded the height of the CN Tower in 2007 (see below).
List of tallest buildings by U.S. state and territory
The following is a list of the tallest buildings by U.S. state and territory. Forty are in their respective state's largest city and 18 are in their state's capital city. The tallest building in the U.S. by architectural height is currently One World Trade Center in New York, which is approximately — more than the combined heights of the tallest buildings in Wyoming, Vermont, Maine, South Dakota, Montana, North Dakota, New Hampshire, and West Virginia. Many are attributed to banks: three to JPMorgan Chase and U.S. Bancorp, and two to Wells Fargo and Bank of America.