Not so. Most of "knockdown 10 year old building, and rebuild" are done for very expensive, luxury developments with much lower density. Think of 2-4 mansion ap

Not so. Most of "knockdown 10 year old building, and rebuild" are done for very expensive, luxury developments with much lower density. Think of 2-4 mansion apartments per floor. Nothing else would've made economic sense. In comparison, the densest tower I seen in China had whooping 24 apartments per floor.