(If you don't have outdoor furniture - borrow it from some friends in trade for babysitting.)

Those that could afford the huge mortgage bought a primary, built ADU and did STRs or MTRs in S.F.

The short version is that you want a strong and diverse job market, low unemployment rates, a growing population, low vacancy rates and new development, affordability/cost of living, real estate laws and court system, good schools, and low crime.Check out the videos from Dave Meyers with BiggerPockets.

Miami Rental Market Update: Rents Drop $200 as Affordability Remains a ChallengeMiami has officially ranked as the second-most unaffordable city in the U.S., but there’s some good news for renters: local rents have dropped to a 3-year low, with decreases of up to $200.

New paint, surface level outdoor remodeling, and new furniture.

I have many times jumped in the dumpster to get large boxes or furniture out to break it down. 

Commissions would be 5% or $50k plus repairs, moving out my furniture etc.

The long-term moves are to get a concession to buy down the rate for good (not a 2-1 or 3-1 buy down), it's a smaller number (i.e. .25% or .5% decrease on the rate), and getting their full closing costs covered is money out of their pocket today they'll be saving that could be huge to give the buyer more money for repairs and/or furniture along with just life expenses. 

I'd recommend looking at costs. your build cost is going to be well over other homes because of the fixed costs like slab, Hvac, roof, etc. check the market drivers and weight the benefits of short term versus long term. long term is no furniture and help pays mortgage but at this size it doesn't really cover everything. we didn't find a lot of economies of scale in single family detached. can you build more than one unit?

If you have an RC Wiley or similar mid/high end furniture/appliance/home furnishings/flooring shop.