But your "same location" is the location that had the single greatest inflation in housing costs in the country. You're drawing your conclusions from an outlier - the outlier, in fact.
I think you're missing the point that it's the first time in American history that children have done worse iff than their parents in 200 years of history. Yeah, SF is expensive, but also everything is expensive. A lot more. Opportunities are not what they used to be. Housing is one part if it, but wages have severely stagnated, and costs of living have definitely increased.