Multiplexes are never a desirable or a hot item. I would pay no more than the listing price, if at all. Better to buy a single family home if you are looking for asset appreciation down the road. Yes it does generate better cash flow but if you really wanted the cash flow why invest in the South Bay at all.
I was exactly thinking the same in the past left 4-plexes in hot Monta Vista area. Big Mistake, multiplexs are too good on cash flow and appreciation when the location is super good. They appreciate equally well.
Across bay area good locations, 2016 & 2017, multiplexes are selling faster than SFH now !