The methodology is to take a hot city like Shanghai or Beijing, and count the number of windows lit up at night on a standard 30 story concrete apartment building. You'll find something like 25% of the units never light up. Now, those are in cities where people want to live, it is much worse in lower tier cities and new districts without services or jobs of lower tier cities.
Property taxes in the US mean you can't speculate so easily on property (you lose ~1% value a year). But they have 99 year leases instead, but everyone thinks the government will let you renew those with minimal fees.
Property taxes in the US mean you can't speculate so easily on property (you lose ~1% value a year). But they have 99 year leases instead, but everyone thinks the government will let you renew those with minimal fees.