In brief. I was talking to a nice woman recently who -- she's white -- strongly asserts that the reason for West Oakland's gentrification is that yountg white couples came in and bought out black home owners.
I don't think this is exactly true, not not far off. I think some of the reason is due to new home construction -- lofts and apartments -- and not so much any "buy out" at all. Moreover the new housing is affordable.