SD is a big city, what has driven prices to such unsupportable levels?
San Diego is pretty much land locked for outward expansion, Mexico to the south, Ocean to the west, Miramar to the north. To the East you have a patchwork of other cities, Indian reservations, and federal lands. So you build on what is there, at higher costs.
If the prices were “unaffordable” or “unpayable”, wouldn’t the market be crashing and not booming?