
Space in the building will be available for purchase this month, reports relate. It could be built quickly because the steel structure was made of prefabricated parts, and 95 percent of the process. The challenge has been met using a total of 10,345 tonnes of beams to build the core of the J57 building also known as Mini Sky City.

Mini Sky City has 19 atriums, office space for 4,000 people, and 800 apartments. Broad Sustainable Building, a Chinese architecture company, recently constructed a 57-story, 800 apartment building in 19 working days. Mini Sky City was built by 1,200 workers working around the clock in Changsha, Hunan province. Original plans called for 97 stories, but height restrictions at a nearby airport shaved off 40 stories. The 19 days were not consecutive: The first 20 floors were completed in 2014 and the remaining 37 were added in January and February. The Broad Sustainable Building Company specializes in prefabrication and speed. Mini Sky City is the worlds tallest prefab building has just been constructed at a rate of 3-storey per day, showcasing the power of modular design and industrial prefabrication operating at scale. The company spent about five months in the factory working on the building's 2,736 components before assembling them at the jobsite, according to reports. Located in Changsha, China, the record-breaking building is designed to be connected by sky bridges to a larger Sky City complex yet to be completed. Modular construction is safe, earthquake proof, cheaper and uses less concrete and water than conventional construction, he added. Mini Sky City is the world's tallest prefab building has just been constructed at a rate of 3-storey per day, showcasing the power of modular design and industrial prefabrication operating at scale.

“With the traditional method, they have to build a skyscraper brick by brick, but with our method, we just need to assemble the blocks,” the company’s engineer, Chen Xiangqian, told the Associated Press. Mini Sky City, located in the Hunan provincial capital of Changsha, is a prefabricated rectangular steel and glass structure. Built at a rate of three stories per day, Mini Sky City has 800 apartments, 19 atriums, and office space for 4,000. The ‘Mini Sky’ tower is constructed around central atria, each three storeys (30ft) high and connected by ramps.
