Other than NYC that's close to 50% more than what you can expect in any large American city. That is not reasonable in any sense of the word. 4k / month mortgage is around a $1 mil home value.
Is a 50% variation in housing costs between large American cities not reasonable in any sense of the word?
The per-capita GDP variation between large American cities is larger than that, and there's no good reason to expect housing to cost the same in very different cities.
Some cities having housing cost at least 50% more (or double) the national average seems like something that would be the case in pretty much any country in any period of history.
