The Shanghai Tower, which is undergoing construction and scheduled to finish by the end of 2014, is seen amid the skyscrapers at financial district of Pudong in Shanghai July 31, 2013.[Photo/Xinhua]

A construction crane lifts the last piece of steel during the topping out ceremony at the Shanghai Tower, which is undergoing construction, at the financial district of Pudong in Shanghai August 3, 2013. The 632 metres (2,073 ft) high Shanghai Tower, which is scheduled to finish construction by the end of 2014, will be the tallest skyscraper in 皇冠体育app and the second tallest in the world.[Photo/Agencies]