Bernie is spot on about the SoCal market. I'm working on an old Pre HUD mobilehome in a resident owned park. The lot's worth about 30 to 40k but the comps are coming in at about 130-150k.
The heirs are from out of state and just want to get the property off their shoulders and be done with it. The home is a toilet and needs to be removed. Plus since it's a pre HUD MH it could never be financed.
So I've offerred 30k (the value of the land only). If accepted I'll remove the heap and install a new Manufactured Home for about 80-90k including demo, site prep, ancillary items i.e. decks, steps, shed, carport and patio cover.
This will bring me in at about 110-120k and leave me a 40-50k ROI. The entire turnaround should be less than 90 days and the HOA fees are only 170/mth (front loaded in the rehab budget along with the property taxes reassessed at 1.2% of adjusted).
I'll take deals like this all day long be they stick/site built or MH as long up to 500k ARV as their in the path of progress.