The world's largest residential building in China houses 20,000 people. Watch Viral Video | On trend

The 675-foot-tall S-shaped building called Regent International was built as a luxury hotel but was converted into a massive apartment building.

It now houses over 20,000 people in thousands of luxury apartments on up to 39 floors.

The building is intended to be a “self-contained community” containing multiple amenities and businesses. These include a huge food court, swimming pools, grocery stores, barber shops, nail salons and cafes.

Since residents can find everything they need inside the building, they don't even have to go outside.

Check out the viral video:

Interestingly, the 20,000 residents do not fill the huge building as it has a maximum capacity of around 30,000 people. This means 10,000 more people can live there.

The video of the gigantic building was viewed almost 60,000 times on X and many users were impressed by the sheer size of the building.

“Whole city under construction”

“It's crazy. How do they manage the water supply and sewage!” one user wondered.

“It’s a whole city in one building,” said a second user.

“This is incredible. It's amazing to see how modern architecture can bring so many people together under one roof and create a unique sense of community,” wrote another user.

“How do they manage deliveries in such a huge building? This must be a logistical challenge,” said a third user.

However, many users were quick to point out security flaws and other challenges residents faced.

“If it collapses due to an earthquake, more than 20,000 people will die. This is too risky,” one comment said.

“The pressure on communal facilities such as lifts and open spaces within the site would be immense. Even in the event of a fire, an earthquake, etc., the first responders will have a very demanding task. The RWA elections here must be interesting…lol,” joked a user.