The Willis Tower (formerly and informally: Sears Tower, its title until 2009) is a 110-story, 1,450-foot (442.1 m) skyscraper in Chicago. At completion in 1973, it surpassed the World Trade Center in New York City to become the tallest building in the world, a title that it held for nearly 25 years; it was also the tallest building in the Western Hemisphere for 41 years, before the new One World Trade Center surpassed it in 2013. While it held the title of'Tallest Office Building' before 2013, it dropped the title of'Tallest Man-Made Construction' after only 3 decades. The CN Tower in Toronto, which functions as a communications tower, took over the title in 1976.
The Willis Tower is considered a seminal accomplishment for engineer Fazlur Rahman Khan. It is currently the third-tallest construction in the USA and the Western hemisphere -- and the 23rd-tallest in the world.
The Carlton Centre is a 50 story skyscraper and shopping centre situated in downtown Johannesburg, South Africa. In 223 metres (732 feet ), it is the second tallest building in Africa following The Leonardo and the tallest office building. The foundations of both buildings in the complex are 5 m (16 feet ) in diameter and extend 15 m (49 feet ) down to the bedrock, 35 m (115 feet ) below street level. The building houses both offices and shops, and has over 46 percent of the floor area below ground level. The Carlton Centre is linked to the Carlton Hotel by a below-ground shopping centre with over 180 shops.Source: Wikipedia
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