I'll bite ... in my experience, a lot depends on the region. This looks like a cherry ... cosmetically well maintained, features that an enthusiast would be looking for (e-Locker), etc. Probably has also been well maintained mechanically, althought he apparently doesn't have full service records. Autocheck indicates no previous accidents. There are still questions that I would want answered, but all in all it looks like a very nice 4Runner.
As for what I would pay for it ... I don't know what the values look like in SoCal (although I would imagine they would be higher than normal), but here in the SouthEast, I've seen similar (and some that didn't look quite that nice) 4Runners at dealerships selling for $10-12K. Personally, I'd want to be on the low end of that range for this vehicle ...