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In this Sept. 22, 2008 file photo, pedestrians cross a road by the side of Taipei 101 in Taipei. Taiwan. According to the nonprofit Council on Tall Buildings and Urban Habitat, Taipei 101 will be the fourth tallest completed building in the world, with a height measured at 1,667 feet, once New York's 1 World Trade Center, with a height of 1,776 feet, is completed. (AP Photo/Chiang Ying-ying, File) ( Tallest Skyscraper )

In this June 27, 2013 file photo, a tourist poses for a photo in front of Malaysia's landmark Petronas Twin Towers in Kuala Lumpur, Malaysia. According to the nonprofit Council on Tall Buildings and Urban Habitat, the Petronas 1 and 2 Towers will be the seventh and eighth tallest completed buildings in the world, with a height measured at 1,483 feet, once New York's 1 World Trade Center, with a height of 1,776 feet, is completed. (AP Photo/Lai Seng Sin, File) ( Tallest Skyscraper-Photo Gallery )

In this Nov. 8, 2013 file photo, the beacon and spire of 1 World Trade Center are lit up, as seen from The Heights neighborhood of Jersey City, N.J. (AP Photo/Julio Cortez, File) ( Tallest Skyscraper )

In this Thursday, Sept. 5, 2013, file photo taken with a fisheye lens, 1 World Trade Center, center, overlooks the wedge-shaped pavilion entrance of the National September 11 Museum, lower right, and the square outlines of the memorial waterfalls in New York. According to the nonprofit Council on Tall Buildings and Urban Habitat, 1 World Trade Center, once completed, will be the third tallest building in the world with a height of 1,776 feet. (AP Photo/Mark Lennihan, File) ( Tallest Skyscraper-Photo Gallery )

This June 25, 2009 file photo shows the Shanghai World Financial Center in Shanghai, China. According to the nonprofit Council on Tall Buildings and Urban Habitat, the Shanghai World Financial Center will be the fifth tallest completed building in the world with the height measured at 1,614 feet, once New York's 1 World Trade Center, with a height of 1,776 feet, is completed. (AP Photo/Eugene Hoshiko, File) ( Tallest Skyscraper-Photo Gallery )

In this Jan. 4, 2010 file photo, the Burj Khalifa is illuminated during the official opening ceremony in Dubai, United Arab Emirates. According to the nonprofit Council on Tall Buildings and Urban Habitat, the Burj Khalifa is the tallest completed building in the world with the height measured at 2,717 feet. (AP Photo/Kamran Jebreil, File) ( Tallest Skyscraper-Photo Gallery )

In this May 10, 2013 file photo, the final piece of spire is hoisted in place on top of 1 World Trade Center in New York. (AP photo/Mark Lennihan, File) ( Tallest Skyscraper )

This Oct. 27, 2012 file aerial image made from a helicopter shows the Abraj Al-Bait Tower, also known as Makkah Royal Clock Tower Hotel, during the annual Hajj in the Saudi holy city of Mecca, Saudi Arabia. (AP Photo/Hassan Ammar, File) ( Tallest Skyscraper-Photo Gallery )

I this Nov. 7, 2013 file photo, the 110-story, 1,450-foot Willis Tower rises above the Chicago skyline. (AP Photo/M. Spencer Green, File) ( Tallest Skyscraper-Photo Gallery )

In this Saturday, Nov. 30, 2008 photo, motorists drive past the under construction Zifeng Tower in Nanjing in east China's Jiangsu province. (AP Photo, File) CHINA OUT ( Tallest Skyscraper Photo Gallery )

This Sept. 19, 2013 file photo, shows the 118-story International Commerce Centre as seen from the Victoria Peak in Hong Kong. (AP Photo/Vincent Yu, File) ( Tallest Skyscraper-Photo Gallery )

In this May 10, 2013 file photo, the silver spire topping 1 World Trade Center is fully installed on the building's roof, bringing the structure to its full, symbolic height of 1,776 feet in New York. (AP Photo/Mark Lennihan) ( Tallest Skyscraper )