The tallest building prefab in the world is now in Changsha of China. The construction of this building, which includes office space for 4.000 individuals and 800 family apartments, It took just 19 days to complete the construction company BSB.

Despite the fact that the building was originally scheduled to have 97 floors, These plans were changed because it is located close to the airport. The building is highly energy efficient with Quad glass which stops CO2 emissions. It also has insulation 20 cm, integrated energy systems for heating and cooling and three-stage air purification process.