List of tallest buildings and structures
The world's tallest artificial structure is the Burj Khalifa in Dubai (of the United Arab Emirates). 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 second-tallest self-supporting structure and the tallest tower is the Tokyo Skytree. The tallest guyed structure is the KVLY-TV mast.
Trump International Hotel and Tower (Chicago)
The Trump International Hotel and Tower rises from the building's main entrance on Wabash Avenue to the tip of the architectural spire. Upon its completion in 2009, the building became the seventh-tallest building in the world, behind the Jin Mao Tower in Shanghai, People's Republic of China. On November 17, 2009, however, the Council on Tall Buildings and Urban Habitat (CTBUH), which composes rankings of the tallest skyscrapers in the world based on various criteria, changed its standard for measuring a building's height. Prior to this change, a building's architectural height was calculated from the main entrance to the tip of the spire; new standards measured from the lowest open-air pedestrian level of a building. As the Trump International Hotel and Tower has a riverwalk entrance and pedestrian level below the building's Wabash Avenue entrance, the skyscraper's official height was recalculated as without a physical addition to the structure. According to the CTBUH, the recalculated height also made the tower the sixth-tallest building in the world, surpassing the Jin Mao Tower by . In January 2010, the building moved back to its position as seventh-tallest with the opening of the Burj Khalifa in Dubai.