They can throw up 8-10 story apartments in Tokyo despite land being very expensive because they tear them down and rebuild them after 20-30 years. Also, Tokyo outside of a few areas isn't that tall, it is definitely dense, but 3-4 story tall building dense (those homes are also torn down and built anew ever 20-30 years, so construction buzzes in Tokyo).

It would be better if you considered new actual living capacity in Tokyo rather than just new constructions.