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A skyscraper is a continuously habitable high-rise building that has over 40 floors and is taller than 150 m (492 ft). Historically, the term first referred to buildings with 10 to 20 floors in the 1880s. The meaning shifted with advancing construction technology during the 20th century. Skyscrapers may host offices, hotels, residential spaces, and retail spaces.
Emporis GmbH is a real estate data mining company with headquarters in Hamburg, Germany. The company collects and publishes data and photographs of buildings worldwide.
The early skyscrapers were a range of tall commercial buildings built between 1884 and 1945, predominantly in the American cities of New York City and Chicago. Cities in the United States were traditionally made up of low-rise buildings, but significant economic growth after the Civil War and increasingly intensive use of urban land encouraged the development of taller buildings beginning in the 1870s. Technological improvements enabled the construction of fireproofed iron-framed structures with deep foundations, equipped with new inventions such as the elevator and electric lighting. These made it both technically and commercially viable to build a new class of taller buildings, the first of which, Chicago's 138-foot (42 m) tall Home Insurance Building, opened in 1885. Their numbers grew rapidly, and by 1888 they were being labelled skyscrapers.
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- ↑ http://skyscraperpage.com/cities/?buildingID=19622 Skyscraper Page