List of tallest buildings
The international non-profit organization Council on Tall Buildings and Urban Habitat (CTBUH) was formed in 1969 and announces the title of "The World's Tallest Building" and sets the standards by which buildings are measured. It maintains a list of the 100 tallest completed buildings in the world. The organization currently ranks Burj Khalifa in Dubai as the tallest at . The CTBUH only recognizes buildings that are complete however, and some buildings included within the lists in this article are not considered finished by the CTBUH.
List of tallest buildings by U.S. state and territory
The building heights compared here are calculated from the ground level to the architectural top and include heights of all habitable structures irrespective of number of occupied floors. Non-freestanding structures, observational towers, and communication towers are excluded (North Dakota boasts the largest guyed mast structure in the world), as are antennas extending from the structure top. However integral spires are included, facilitating One World Trade Center to be considered taller than Willis Tower, even though the highest occupied floor of Willis Tower is higher than that of One World Trade Center. The Council on Tall Buildings and Urban Habitat is considered the arbiter for any dispute. For more information, see building heights.