I would challenge that statement. The blacks left by their own choice. They cashed out, selling high-priced homes for cheaper homes across the Bay. There has been an exodus in the last few decades, from over 15 percent to 6 percent now. Most decided to take the money and run to cheaper housing. Sell a home in SF for $800K, buy another in the East Bay for under $400K. Easy math. The other reason is that techies are moving into the city for the tech boom. Mostly whites and Asians taking tech jobs(I.T., biotech, medical etc.) A lot of blacks don't want to study hard sciences and seek those jobs. The industrial jobs are in the East Bay. Blacks aren't priced out, no more than whites and asians are priced out. Those that can do, stay, those who can't do, leave.
What percentage of the blacks that left were homeowners as opposed to renters?
Somehow I think they got priced out of the market, not that they sold out at high prices.
Not saying this is a bad thing, it is pure economics at work, but I don't think many non-homeowners benefitted from the housing cost increase.