World's largest building opens in China China has opened to the public what is billed as the world's largest building - a vast, wavy rectangular box of glass and steel that will house shops, offices and a faux ocean beach with a huge LED screen for video sunsets. The New Century Global Centre in the city of Chengdu has 1.7m sq.m of floor space and edges out the previous record-holder, the Dubai airport. The project is a sign that China's growth has spread from the country's more prosperous eastern and southern regions to the west.