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The Council on Tall Buildings and Urban Habitat (CTBUH) is an international body in the field of tall buildings and sustainable urban design. A non-profit organization based at the Illinois Institute of Technology in the city of Chicago, Illinois, United States, the CTBUH announces the title of "The World's Tallest Building" and is widely considered to be an authority〔(【引用サイトリンク】title=Dubai tops residential skyscrapers )〕〔(【引用サイトリンク】title=What’s the Hemisphere’s Tallest Residential Building? (Hint: It’s Not Here) )〕 on the official height of tall buildings. Its stated mission is to study and report "on all aspects of the planning, design, and construction of tall buildings." The Council was founded at Lehigh University in 1969 by Lynn S. Beedle, where its office remained until October 2003, when it moved to the Illinois Institute of Technology in Chicago.〔(【引用サイトリンク】title=Council History )〕 == Ranking tall buildings == The CTBUH ranks the height of buildings using three different methods:〔(【引用サイトリンク】url=http://www.ctbuh.org/TallBuildings/HeightStatistics/Criteria/tabid/446/language/en-GB/Default.aspx )〕 #Height to architectural top: This is the main criterion under which the CTBUH ranks the height of buildings. Heights are measured from the level of the lowest, significant, open-air, pedestrian entrance to the top of the building, inclusive of spires but excluding items such as flagpoles and antennae. #Highest occupied floor: Height to the floor level of the highest floor that is occupied by residents, workers or other building users on a consistent basis. #Height to tip: Height to the highest point of the building, including antennae, flagpoles, and technical equipment. A category measuring to the top of the roof was removed from the ranking criteria in November 2009. This is because flat-topped skyscrapers are not as common in the modern era as skyscrapers with intricate spire designs and parapet features atop their roofs, making it more difficult to define the roof of a building. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Council on Tall Buildings and Urban Habitat」の詳細全文を読む スポンサード リンク
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