The things that make housing affordable here are the zoning codes and laws which basically prevent neighbors from restricting development. Lack of stupid laws dictating how development must be done help a lot too: things like setbacks, parking requirements, etc.
Of course, there's significant survivor bias here, because there were plenty of shoddy older buildings that have been torn down.
Brick buildings don't exist in Japan. Any such structure would quickly collapse in an earthquake. Any older buildings that still exist were either exceptionally well-built for the time, and/or were retrofitted to meet modern earthquake standards. So some historic buildings are still around because they're valuable for cultural or historic reasons, but this doesn't include housing built in the last century.
I'd take modern wood frame construction or aerated concrete with insulation and a brick veneer over a cavity wall or a full brick wall any day.
Because new buildings these days are invariably the same boring gray dull shit that robs any place of its identity?