Workers hang from the side of residential buildings under construction in the Chinese port city of Tianjin September 11, 2012. China has this year invested 820 billion yuan ($129 billion) in 6.5 million public home building starts as of the end of August, the Ministry of Housing and Urban-Rural Development said, putting it on track to achieve an ambitous construction target. REUTERS/David Gray (CHINA - Tags: BUSINESS EMPLOYMENT CONSTRUCTION)