Greater Tokyo Area? Tokyo Metropolis? Previous Tokyo City limits? New York City metro area? New York City? Manhattan? These can be 2 orders of magnitude apart in scale but they've all been talked about like it was the same location A and location B.
At the small scale Tokyo's densest ward is ~22,700/km^2 and Manhattan is ~28,800/km^2 with Manhattan being ~4x-5x the land area of the former (i.e. the core is a lot more dense). At the large scale the Greater Tokyo Area is ~2,900/km^2 and the New York Metropolitan Area is ~2,053/km^2 (i.e. the urban area around Tokyo is a lot more dense).
"Tokyo" is a good example that you can get affordable housing by focusing on how to spread the population over a large urban area but it's not a good example building more housing downtown is a scalable approach.
At the small scale Tokyo's densest ward is ~22,700/km^2 and Manhattan is ~28,800/km^2 with Manhattan being ~4x-5x the land area of the former (i.e. the core is a lot more dense). At the large scale the Greater Tokyo Area is ~2,900/km^2 and the New York Metropolitan Area is ~2,053/km^2 (i.e. the urban area around Tokyo is a lot more dense).
"Tokyo" is a good example that you can get affordable housing by focusing on how to spread the population over a large urban area but it's not a good example building more housing downtown is a scalable approach.