A 57-story skyscraper built from prefabricated Lego-like blocks was completed at a record speed of 19 days, a Chinese company says, showing an impressive time lapse video of the construction.

The skyscraper, based in Changsha, southeast China, was fully built with energy-efficient, factory-produced blocks at the speed of three stories per day, the Chinese Broad Sustainable Building company said.

The building covers 180,000 square meters and has office space for 4,000 people and 800 households.

The company claims that the building is eco-conscious as the use of the Lego-like prefabricated blocks reduces the use of concrete by 15,000 trucks and almost no dust was released.

With air pollution being one of the most troubling issues in the country of over 1.3 billion people, the company claims that all of the air inside the building is cleaner than outside due to the tight construction and built-in air conditioning system.

Initially, the Chinese company planned to build a 97-story building, but the height was lowered to 57 stories due to the proximity to the local airport. The project also had a major delay for one year in the middle of the construction as officials reviewed the plans.

This is not the first time the Chinese Broad Sustainable company aimed to set a speed record – in 2012 it accomplished the construction of a 30-story building in Changsha in just 15 days.

Meanwhile, in April 2014, the privately owned Chinese WinSun company, based in eastern China, made 10 full-size houses using a huge 3D printer in the space of a day.