The Regent International apartment building in Hangzhou, China with 30,000 residents

According to an article by Chinese news agency Sina, smaller apartments without windows usually rent for around 1,500 RMB ($220) per month, while larger units with balconies can rent for up to 4,000 RMB (550 USD) per month or more. Judging by the bustling atmosphere, Regent International has plenty of tenants.