Willis Tower vs Naberezhnaya Tower

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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.

Annually, several million people visit its observation deck, the highest in the USA, which makes it one of Chicago's most popular tourist destinations. The arrangement was renamed in 2009 by the Willis Group as a term of its lease. As of April 2018, the building's largest tenant is United Airlines, which moved its corporate headquarters in 77 West Wacker Drive (then the United Building) in 2012, occupying around 20 flooring. Other major tenants include the building's namesake Willis Towers Watson and law firms Schiff Hardin and Seyfarth Shaw. Morgan Stanley plans to move into the construction in 2019 and become its fourth-largest tenant by 2020.

Source: Wikipedia

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Naberezhnaya Tower (Russian: ????? ?? H?????????, tr. Bashnya na Naberezhnoy, literally means Tower on the Embankment) is an office complex composed of two skyscrapers and a high-rise situated on plot 10 in the Moscow International Business Center (MIBC) in Moscow, Russia with a total area of 254,000 m2 (2,730,000 sq feet ). The buildings are named after the first three letters of the alphabet and by the bottom height to the tallest: the 17-story tall Tower A, the 27-story tall Tower B, along with the 59-story tall Tower C. Construction of the complex started in 2003, with Tower A being completed in 2004, Tower B in 2005, and Tower C at 2007. Tower C is the tallest building from the complex, with a height of 268.4 metres (881 feet ) and 59 stories. It is formerly the tallest building in Russia and Europe, surpassing the Triumph Palace, also in Moscow, in August 2007. Tower C was surpassed by its neighboring skyscraper Moscow Tower of the City of Capitals complex as the tallest building in July 2008.

Source: Wikipedia