57-floor building goes up in 19 days

Mini Sky City project in Changsha used parts assembled at plants for high energy efficiency and environmental friendliness

Editor's note: In recent years, China has witnessed the largest growth in building construction in the world, around 2 billion square meters of floor space added annually, with the associated huge amount of waste generated during the building work. Prefabrication may offer a solution to the waste problem, as well as creating green buildings.

Changsha company Broad Sustainable Building has built a 57-floor building in only 19 days in Februday, handling the construction as if working with Lego blocks, as many netizens commented after seeing an online video of the work.