source : CTBUH
Within this decade we will likely witness not only the world’s first kilometer-tall building, but also the completion of a significant number of buildings over 600 meters (around 2,000 feet) – that’s twice the height of the Eiffel Tower. Two years ago, prior to the completion of the Burj Khalifa, this building type did not exist. And yet, by 2020, we can expect at least eight such buildings to exist internationally. The term “supertall” (which refers to a building over 300 meters) is thus no longer adequate to describe these buildings: we are entering the era of the “megatall.” This term is now officially being used by the Council to describe buildings over 600 meters in height, or double the height of a supertall
Figure 1. Diagram of the predicted World's 20 Tallest in the year 2020 as of Dec 2011 © CTBUH
It is also useful to understand the tallest 20 in 2020 in the context of global tall building trends. The average height of these twenty buildings is predicted to be 598 meters (1,962 feet). Yet, as we stand at the end of 2011, there are actually only 61 buildings currently in existence over 300 meters (the threshold for “supertall”). Until recently, in fact, the completion of a supertall was rather a rare occurrence, with only 15 supertalls completing in the 65 years between the world’s first such building (New York’s Chrysler Building, 1930) and 1995. It was only in the mid 1990s that it became common for more than one supertall to be added to the lists annually, with 1995 being the last year when no supertalls were completed. Now, less than two decades later, the number of supertalls completed annually has entered double digits, and is set to continue to rise. Meanwhile, the number of megatalls set to complete in the upcoming decade is similar to the number of supertalls completed in the 90s (see Figure 7). In terms of height, therefore, 600 m seems to be the new 300
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