My opinion is anyone that has to ask where/how to find off-market (underground) properties is better served by purchasing off the MLS. 

It is likely better to under charge on rent than over charge as vacancy can quickly overcome the rent delta.  

Quote from @Michael Daley: This is why I'm thinking more about taking the STR route until I can refi with a better interest rate. 2 units (2/1) in a good area at $1.3 with some ability to update and has a garage or ADU capability would work if we can get $5000 per month for each unit.$10k STR rent on $1.3m property at 80% LTV  will be negative cash flow when properly allocating for all the expenses.  

Better off pulling the listings for a refi in December, and coming back on the market in January.Hopefully you get these sold!

It’s better to have part of something than all of nothing.

The goal is to make your life better.

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But since you are in California, a land trust might be a better route.

Owning 75% of a home with no money out of picket is much better than owning 0% of a property :)

If you are looking for rental income, you may have better luck finding cashflowing properties on the westside of town (Fort Worth, Arlington) due to the higher price/rent ratio.