Four World Trade Center vs Canton Tower

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4 World Trade Center (also known by its street address, 150 Greenwich Street) is a skyscraper that's part of the World Trade Center complex in New York City. It is situated on the southeast corner of this 16-acre (6.5 ha) World Trade Center site, where the original nine-story 4 World Trade Center stood. Pritzker Prize-winning architect Fumihiko Maki was awarded the contract to design the 978-foot-tall (298 m) building. It houses the headquarters of the Port Authority of New York and New Jersey (PANYNJ).

The building's groundbreaking took place in January 2008, and it opened to tenants and the general public on November 13, 2013. As of 2016, it's the third tallest skyscraper in the rebuilt World Trade Center, supporting One and 3 World Trade Center. However, 2 World Trade Center is expected to surpass the height of both 4 and 3 WTC upon completion. The whole floor space of the building comprises 1.8 million square feet (167,000 square meters) of office and retail space.

Source: Wikipedia

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The Canton Tower (Chinese: ???), officially Guangzhou TV Astronomical and Sightseeing Tower (Chinese: ???????????), is a 604-meter (1,982 feet )-tall multipurpose monitoring tower in the Haizhu District of Guangzhou (alternatively romanized as Canton). The tower was topped out in 2009 and it became operational on 29 September 2010 for the 2010 Asian Games. The tower briefly held the title of tallest tower in the world, replacing the CN Tower, before being surpassed by the Tokyo Skytree. It was the tallest structure in China prior to the topping out of the Shanghai Tower on 3 August 2013, and is now the second tallest tower and the fourth-tallest freestanding structure in the world.

Source: Wikipedia