San Francisco, and several other American cities, were places for freaks and weirdos in the mid-20th century because of a historical anomaly in which the US federal government deliberately subsidized white, middle-class families into leaving for nearly-created suburbs. This trend began reversing in the 1980s and now land-values in the urban core reflect what is seen in cities all over the rest of the world -- that central areas have higher land and housing costs than the periphery.

It was a great, interesting, trippy twenty to thirty-year period, but it doesn't exist anymore and its loss in the Bay Area was probably accelerated in part because California has such an unusually politicized and unpredictable land-use and development process that has led it to consistently underproduce housing for the last 40 years.

http://www.lao.ca.gov/reports/2015/finance/housing-costs/hou...

The "young Gods" you speak of tend to have higher incomes not just because of the tech industry. They have higher costs because the elder babyboomer Californians rigged and created a system that is so constricted that only the wealthiest millennials can afford to participate in it.

Look at the differences in housing cost burdens based on year of birth here: http://www.lao.ca.gov/LAOEconTax/Article/Detail/120