zlacker

And on top of that, your social peers are very nearby. Whereas even in walkable cities like NYC or SF, the cities are big enough that your peers may also be in a walkable area but far enough away to require public transit/careful planning.

I have read that one consequence of the Japanese practice of tearing down buildings and buying new is that you tend to get colocated with many people of the same socioeconomic class and age. We have similar forces going on in the Western world (families may prefer suburbs which also tend to sort by SES, yuppies prefer nice urban areas, etc) but I think in Japan it is a bit more deliberate.