In California markets, rental properties are not profitable, when you consider 20% downpayment, 75% rent, etc.
There are 4 kinds of buyers in this market:
1. First home buyers: renters becoming buyers. 2. Second home buyers: thanks to the appreciation of their primary residence, people have bought second homes for "retirement nest egg", "return on equity", etc. Borrow 80% at 4.5%, expect 15% return. 3. Moving Up: same like (2), but they sell primary residences. 4. Flippers
It is kind of hard of flippers to get conventional loans; they have to use portfolio banks, banks that keep loans on their books. A bank I know of, offers 6% fixed first year, variable rate for the next five years. Flippers get these deals, after putting 20 to 30% down.