This is for some of the HPC homies, you know who you are...
I've spoken about cage homes in Hong Kong a few times where people rent 16sq foot beds as flats for about $1000HK a month. It appears yet again as if China is taking up this too (there is an article somewhere where I can't remember where I stored it on one of my drives which has even smaller. You can read about HK cage homes here. Anyway Beijing has caught up with the modern
IIRC these um apartments cost about 1/24th -1/12th of a typical person's income. Heh if this was in the UK or Europe or maybe New York/LA they'd want an arm and a leg for it!