In the period after the downturn and just before the market started to tick up in mid 2012, there were a number of Asian investors buying up large swaths of foreclosed and distressed homes in Oakland for cash.
I recall this specifically, as I was in the market for a house at the time. Fortunately, I didn't face much cash competition as I was shopping slightly upmarket. The line seemed to be $300-400k. Those folks would be seeing pretty good returns at this point as those houses are now typically worth $500-600k and might be renting for $2-3k.