These areas are only growing from net migration in because the housing there is so expensive that the people from there can no longer keep up, and most of their

These areas are only growing from net migration in because the housing there is so expensive that the people from there can no longer keep up, and most of their kids have to move away in early adulthood to establish their own household because they can no longer afford it at early career salary levels like their parents once could. What you are painting as the cause is actually the effect.