Anyway, here's the report in question: http://www.everettprogram.org/main/wp-content/uploads/TIGHTR...
Reading the fine details of the report, you see that the top-line metric is real income, adjusted for inflation and local cost of living. And the #1 factor that's proved ruinous to local cost of living in the Bay Area these past two decades is of course housing prices. If zoning restrictions were relaxed and more housing was allowed to be built, costs would be reduced and a lot of these problems would be solved. The Bay Area has a critical lack of housing, which is driving all these prices up and causing most of the decline in CoL-adjusted non-tech wages.