Instruct: Given a question, retrieve relevant passages that can help answer the question.
Query: What is the worlds tallest building?
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 828m (2,717ft).[3] 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.
This list of future tallest buildings ranks the tallest buildings in the world which are planned or currently under construction. The Burj Khalifa with a roof height of is currently the world's tallest building.
However, though all of these are "structures", some are not "buildings" in the sense of being regularly inhabited or occupied. It is in this sense of being regularly inhabited or occupied that the term "building" is generally understood to mean when determining what is the world's tallest building. The non-profit international organization Council on Tall Buildings and Urban Habitat (CTBUH), which maintains a set of criteria for determining the height of tall buildings, defines a "building" as "(A) structure that is designed for residential, business or manufacturing purposes" and "has floors".
The tallest building in the province of Ontario is First Canadian Place 298 meters (978 feet). Completed in 1976, it is also the tallest building in Canada and the 68th tallest building in the world. At the time of its completion, it was the tallest building in the world outside of Chicago and New York City.
New York City, the most populous city in the United States, is home to over 6,486 completed high-rise buildings of at least 35 meters, of which at least 113 are taller than . The tallest building in New York is One World Trade Center, which rises . The 104-story skyscraper also stands as the tallest building in the United States, the tallest building in the Western Hemisphere, and the sixth-tallest building in the world. The second-tallest building in the city is 432 Park Avenue, standing at , and the third-tallest is the recently-topped-out 30 Hudson Yards. Not counting its antenna, the 4th-tallest is the 102-story Empire State Building in Midtown Manhattan, which was finished in 1931 and rises to , increased to by its antenna. It is the fifth-tallest building in the United States and the 37th-tallest building in the world.
"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).
With the destruction of the World Trade Center in the September 11 attacks, the Empire State Building again became the tallest building in New York City, and the second-tallest building in the Americas, surpassed only by the Willis Tower in Chicago. The Empire State Building remained the tallest building in New York until the new One World Trade Center reached a greater height in April 2012. , it is the fourth-tallest building in New York City after One World Trade Center, 432 Park Avenue, and 30 Hudson Yards. It is the fifth-tallest completed skyscraper in the United States behind the two other tallest buildings in New York City, as well as the Willis Tower and Trump International Hotel and Tower in Chicago. The Empire State Building is the 28th-tallest in the world , the tallest being Burj Khalifa in Dubai. It is also the sixth-tallest freestanding structure in the Americas behind the five tallest buildings and the CN Tower.
This list of tallest buildings in the United Arab Emirates ranks skyscrapers in the UAE based on official height. The tallest building in United Arab Emirates is Burj Khalifa, which rises and contains 163 floors. The tower has stood as both the tallest building in the world and the tallest man-made structure of any kind in the world since its completion in January 2010. The second-tallest building in United Arab Emirates is the Princess Tower, which also stands as the world's second tallest residential skyscraper after the 432 Park Avenue in New York City, NY. The skyscrapers of United Arab Emirates are mostly located in Dubai, and Abu Dhabi.
This list of tallest buildings in Taipei ranks skyscrapers in the Taiwanese capital of Taipei by height. The tallest building in Taipei is currently the 101–story Taipei 101, which rises and was completed in 2004. It was officially classified as the world's tallest from 2004 to 2010. Now, it is still the tallest building in Taiwan, Asia's 6th tallest building and the world's 9th tallest building. There are currently several buildings over 200m under construction in Taipei, including the Gate of Taipei towers A and B, which are under planning and will reach and respectively, and the Taipei Sky Tower, which is under construction in Xinyi District and will reach .
It was not until the completion of the Ulm Minster in 1890 that the world's tallest building was again also the tallest building ever constructed, surpassing the original configuration of Lincoln Cathedral.
* – Also set record at time of completion as tallest building ever built.
History of the world's tallest buildings List of tallest buildings by height to roof List of tallest twin buildings and structures List of buildings with 100 floors or more List of architects of supertall buildings List of cities with the most skyscrapers List of cities with the most high-rise buildings List of future tallest buildings List of tallest buildings in Asia List of tallest buildings in Southeast Asia List of tallest buildings and structures in South Asia List of tallest buildings and structures List of largest buildings List of tallest freestanding structures List of tallest hotels List of tallest residential buildings List of tallest structures List of tallest structures by country Skyscraper Index
The Empire State Building stood as the tallest building in the world from its completion until 1972, when the 110-story North Tower of the original World Trade Center was completed. At , The World Trade Center held the title until the completion of the 108-story Willis Tower (formerly known as the Sears Tower) in Chicago in 1974. The World Trade Center towers were destroyed by terrorist attacks in 2001, and the Empire State Building regained the title of tallest building in the city. It remained the tallest until April 2012, when the construction on One World Trade Center surpassed it. The fifth-tallest building in New York is the Bank of America Tower, which rises to , including its spire. If the Twin Towers were still standing today, they would be the third- and fourth-tallest buildings in the city, or second and third assuming the new buildings would not have been built. Only 432 Park Avenue is taller.
This list of skyscrapers in Taiwan ranks skyscrapers in Taiwan by height. The tallest building in Taiwan is currently the 101–story Taipei 101, which rises and was completed in 2004. It was officially classified as the world's tallest from 2004 to 2010. Now, it is still the tallest building in Taiwan, Asia's 6th tallest building and the world's 9th tallest building. There are currently six buildings over 200m under construction in Taiwan, including the Taipei Twin Tower 1, which is under planning and will reach and the Taipei Sky Tower, which is under construction in Taipei and will reach . 
U.S. Steel Tower, also known as the Steel Building, or UPMC Building (the largest tenant), (formerly USX Tower), is a 64-story, skyscraper at 600 Grant Street in downtown Pittsburgh, Pennsylvania 15219. It has with of leasable space. It is the tallest skyscraper in Pittsburgh, the fifth tallest building in Pennsylvania, the 52nd tallest in the United States, and the 200th+ tallest building in the world. It is the tallest building in the world with a completely flat roof. It held its opening dedication on September 30, 1971.
The buildings that were the tallest secular skyscrapers, which excludes religious buildings, were:
The list of tallest buildings is based on the default metric of the Council on Tall Buildings and Urban Habitat (CTBUH), that of measuring to the highest architectural element. Other criteria would generate a different list. Shanghai World Financial Center is not on the above list, but it surpassed Taipei 101 in 2008 to become the building with the highest occupied floor. Using the criteria of highest tip (including antennae), the World Trade Center in New York City was the world's tallest building from 1972 to 2000, until the Sears Tower in Chicago (which already had a higher occupied floor than the World Trade Center) had its antenna extended to give that building the world's tallest tip; a title it held until the 2010 completion of Burj Khalifa. Petronas Towers and Taipei 101 were never the world's tallest buildings by the highest–tip criteria.
The JPMorgan Chase Tower, formerly Texas Commerce Tower, is a , , 75-story skyscraper at 600 Travis Street in Downtown Houston, Texas, United States. It is currently the tallest building in the city, the tallest building in Texas, the tallest five-sided building in the world, the 19th-tallest building in the United States, and the 107th-tallest building in the world.
This section lists the total number of skyscrapers in each country or city featured in the future world's 50 tallest buildings. Only cities with more than one building featured in the world's future 50 tallest buildings are included in the 'tallest by city' section. (Only at the list.)
The city then experienced a second, much larger building boom, which was at its peak between 1967 and 1976. This period saw the construction of Canada's three tallest buildings and 6 of its top 10 (at the time). When finished, the TD Tower was the 14th tallest building in the world (1967). The TD Tower would soon be followed by Commerce Court West, the 14th tallest building in the world at the time of its completion in 1972. Later, Canada's current tallest building, the First Canadian Place, became the 6th tallest building in the world at the time of its completion in 1975. After the mid-1970s, the pace of the boom slowed considerably but continued onto the early 1990s, culminating with the construction of the city's and Canada's second and third tallest buildings: Scotia Plaza and the TD Canada Trust Tower.
From the 13th century until 1894, the world's tallest building was always a church or cathedral. Old St Paul's Cathedral with its spire was completed in the 13th century. The central spire of Lincoln Cathedral surpassed Old St Paul's in the early 14th century. The Lincoln Cathedral's spire collapsed in 1549, beginning a long interval where the status of world's tallest building was borne by shorter buildings. St. Mary's Church in Stralsund became the world's tallest building after the collapse of Lincoln Cathedral's spire. The central tower of St. Pierre's Cathedral was tallest from 1569 until it collapsed in 1573, making St. Mary's the tallest once again. In 1647, the bell tower of St. Mary's burned down, making the shorter Strasbourg Cathedral the world's tallest building.
List of tallest buildings in Texas / the United States / the world List of tallest buildings in Austin, Texas List of tallest buildings in Fort Worth List of tallest buildings in Houston List of tallest buildings in San Antonio
This list of tallest buildings in Guangzhou lists skyscrapers in Guangzhou, China by height. The tallest building in Guangzhou is currently Guangzhou CTF Finance Centre, which stands tall. It is also the third-tallest building in China and the seventh-tallest in the world. Though generally not considered as a building, standing tall, Canton Tower is tallest structure in Guangzhou. 
The world's tallest artificial structure is the 829.8-metre-tall (2,722ft) 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.
As completed, 432 Park Avenue is the third-tallest building in the United States and the tallest residential building in the world. It is the second-tallest building in New York City, behind One World Trade Center, and ahead of the Empire State Building. It is also the first, and so far only, building in New York City outside the World Trade Center Complex to be taller than the original Twin Towers. Upon completion, it became the tallest building in the world known by its street address.
This list of tallest buildings in Kuwait ranks skyscrapers in Kuwait by height. The tallest building in Kuwait is currently the 80–story Al Hamra Firdous Tower, which rises and was completed in 2011, it is also the world's fifteenth-tallest building. Liberation Tower is currently the second-tallest completed tower in Kuwait, built in 1996 it rises . Should it be constructed, the Burj Mubarak Al Kabir would be tall, it would become the world's tallest building, standing one metre taller than the approved Jeddah Tower in Jeddah, Saudi Arabia.
The tallest structure in Frankfurt is the Europaturm, which rises however, the observation tower is not generally considered a high-rise building as it does not have successive floors that can be occupied. The tallest habitable building in Frankfurt is the Commerzbank Tower, which rises and 56 floors. As of October 2011, the structure is the 197th-tallest building in the world, the seventh-tallest building in Europe and the second-tallest building in the European Union. The second-tallest building in the city is the Messeturm, which rises tall and has 55 floors. The 10 tallest buildings in Germany are located in Frankfurt. 