Willis Tower vs Guangzhou International Finance Center

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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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Guangzhou International Finance Center or Guangzhou West Tower, is a 103-story, 438.6 m (1,439 Feet ) skyscraper at Zhujiang Avenue West in the Tianhe District of Guangzhou, Guangdong.

One half of the Guangzhou Twin Towers, it's the 23rd tallest building in the world, completed in 2010. As of March 2018, it's the world's tallest building with a roof-top helipad, at 439 m (1,439 feet) high. The world's second-tallest building with a roof-top helipad was also completed in 2010: Beijing's China World Trade Center Tower III, whose roof-top helipad is 330 m (1,083 feet) high. Both buildings are taller than the U.S. Bank Tower, the previous record-holder from 1989 to 2010, whose roof-top helipad is simply 310.3 m (1,018 feet) high. Construction of the building, designed by WilkinsonEyre, broke ground in December 2005, and has been completed in 2010. The building is used as a conference centre, hotel and office building. Floors 1 through 66 are used as offices, flooring 67 and 68 are for mechanical equipment, flooring 69 to 98 possess a Four Seasons Hotel with the reception being on the 70th floor, and flooring 99 and 100 are used as an observation deck. The building was previously called Guangzhou West Tower and had a related project, the projected Guangzhou East Tower, which, at 475 m (1,558 ft), could have been even taller, though that project has been awarded to another design by Kohn Pedersen Fox, the 530 m (1,740 ft) Guangzhou CTF Finance Center.The building was the winner of the RIBA 2012 Lubetkin Prize.

Source: Wikipedia