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The height of its roof 449.2 m (1,474 ft) and highest occupied floor 439.2 m (1,441 ft) had been surpassed by the Shanghai World Financial Center with corresponding heights of 487 and 474 m (1,598 and 1,555 ft). Taipei 101 in Taipei, Taiwan, set records in three of the four skyscraper categories at the time it opened in 2004 at the time the Burj Khalifa opened in 2010 it remained the world's tallest inhabited building 509.2 m (1,671 ft) as measured to its architectural height (spire). The Magnolia Tension-leg Platform in the Gulf of Mexico is even taller with a total height of 1,432 m (4,698 ft). Despite this, Guinness World Records 2009 listed the Ursa tension leg platform as the tallest structure in the world with a total height of 1,306 m (4,285 ft). However, these platforms are not considered constant structures as the vast majority of their height is made up of the length of the tendons attaching the floating platforms to the sea floor. The tension-leg type of oil platform has even greater below-water heights with several examples more than 1,000 m (3,300 ft) deep. The Troll A platform is 472 m (1,549 ft), without any part of that height being supported by wires. However, it is debated whether underwater height should be counted, in the same manner as height below ground is ignored on buildings. The Petronius Platform stands 610 m (2,000 ft) off the sea floor, leading some, including Guinness World Records 2007, to claim it as the tallest freestanding structure in the world, until surpassed by the Burj Khalifa in 2010. Guyed lattice towers such as these masts had held the world height record since 1954. That September it officially surpassed Poland's 646.38 m (2,120.7 ft) Warsaw radio mast, which stood from 1974 to 1991, to become the tallest structure ever built. By Apit had been built higher than the KVLY-TV mast in North Dakota, US. The tallest artificial structure is Burj Khalifa, a skyscraper in Dubai that reached 829.8 m (2,722 ft) in height on January 17, 2009. This category does not require the structure to be "officially" open, but does require it to be "topped out." Main article: List of tallest structures Warsaw radio mast, the height record holder from 1974 to 1991 The CN Tower in Toronto, was the world's tallest freestanding structure from 1975 to 2007.

whether a floor built at a high level of a telecommunications or viewing tower should change the tower's definition to that of a "building".

whether rooftop antennas, viewing platforms or any other architecture that does not form a habitable floor should be included in the assessment.

whether communication towers with observation galleries should be considered "habitable" in this sense.

whether only habitable height of the building is considered.

Within an accepted definition of a building further controversy has included the following factors:

whether a structure, building or tower that is guyed is assessed in the same category as self-supporting structures.

whether structures built in and rising above water should have their below-water height included in any assessment.

whether a structure, building or tower has to be officially opened before it is assessed.

whether a structure, building or tower under construction should be included in any assessment.

the definition of a structure, a building and a tower.

Some of the controversy regarding the definitions and assessment of tall structures and buildings has included the following: The Council on Tall Buildings and Urban Habitat has changed its definitions over time. Because varying standards have been used by different organizations, the accepted height of these structures or buildings depends on which standards are accepted. The assessment of the height of artificial structures has been controversial.

There are dozens of radio and television broadcasting towers which measure over 600 metres (about 2,000 ft) in height, and only the tallest are recorded in publicly available information sources. Structures that do not meet this criterion, such as the CN Tower, are defined as " towers".

The Council on Tall Buildings and Urban Habitat, an organization that certifies buildings as the "World's Tallest", recognizes a building only if at least 49% of its height is made up of floor plates containing habitable floor area. The tallest guyed structure is the KVLY-TV mast in North Dakota, USA at 606 metres (1,987 ft). The second-tallest self-supporting structure and the tallest tower in the world is the Tokyo Skytree.

The building gained the official title of " tallest building in the world" and the tallest self-supported structure at its opening on January 9, 2010. The world's tallest human-made structure is the 828-metre-tall (2,717 ft) Burj Khalifa in Dubai, United Arab Emirates.