Construction company Broad Sustainable Building has built a 57-storey skyscraper in central China in just 19 days.
The new rectangular, glass and steel Mini Sky City skyscraper, which had an estimated cost of RMB9bn ($1.46bn), was erected by the Chinese company in the Hunan provincial capital of Changsha.
Broad Sustainable vice-president Xiao Changgeng told Associated Press in Changsha that the company used a modular method to assemble three floors a day.
The skyscraper, which has the capacity to withstand earthquakes, comprises 19 atriums, 800 apartments and office space to accommodate 4,000 peoplem, is said to be put up for sale in May.
Prior to fabricating the building's 2,736 modules, Broad Sustainable Building spent four and a half months on the project.
The company completed the initial 20 floors in 2014, while the remaining 37 were built from 31 January to 17 February in 2015.
For transportation, 104 high-speed elevators have been installed in the building, and the four-layered glass used for the building's windows will keep the temperature of the building constant.
Air inside the structure is measured to be 20 times cleaner than the air outside, and the lamps used in the building will be made of LEDs.