tallest building in the world-tallest building in the world 2017

List of tallest buildings

 The 828-metre (2,717 ft) tall Burj Khalifa

in Dubai has been the world's tallest building 

since 2008. The Burj Khalifa has been classified 

as Megatall.

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 The 828-metre (2,717 ft) tall Burj Khalifa

in Dubai has been the world's tallest building 

since 2008. The Burj Khalifa has been classified 

as Megatall.

Ranking criteria and alternatives

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.^[3] The organization currently ranks Burj Khalifa in Dubai as the tallest at 828 m (2,717 ft).^[3] The CTBUH only recognizes buildings that are complete, however, and some buildings listed within these list articles are not considered complete by the CTBUH.

In 1996, as a response to the dispute as to whether the Petronas Towers or the Sears Tower was taller,^[4] the council listed and ranked buildings in four categories:

• height to structural or architectural top;
• height to floor of highest occupied floor;
• height to top of roof (removed as category in November 2009);^[5] and
• height to top of any part of the building.

Spires are considered integral parts of the architectural design of buildings, to which changes would substantially change the appearance and design of the building, whereas antennas may be added or removed without such consequences. The Petronas Towers, with their spires, are thus ranked higher than the Willis Tower (formerly the Sears Tower) with its antennas, despite the Petronas Towers' lower roofs and lower highest point.

Until 1996, the world's tallest building was defined by the height to the top of the tallest architectural element, including spires but not antennae. This led to a rivalry between the Bank of Manhattan Building and the Chrysler Building. The Bank of Manhattan Building employed only a short spire and was 927 ft (282.5 m) tall and had a much higher top occupied floor (the second category in the 1996 criteria for tallest building). In contrast, the Chrysler Building employed a very large 125 ft (38.1 m) spire secretly assembled inside the building to claim the title of world's tallest building with a total height of 1,046 ft (318.9 m), although it had a lower top occupied floor and a shorter height when both buildings' spires were excluded.

Upset by Chrysler's victory, Shreve & Lamb, the consulting architects of the Bank of Manhattan Building, wrote a newspaper article claiming that their building was actually the tallest, since it contained the world's highest usable floor. They pointed out that the observation deck in the Bank of Manhattan Building was nearly 100 ft (30.5 m) above the top floor in the Chrysler Building, whose surpassing spire was strictly orn
amental and inaccessible.^[6]

At present, the Burj Khalifa tops the list by some margin, regardless of which criterion is applied.^[7][8]