Really so many options and variations it can be quite exciting. 

Create your own by adding an accessory dwelling to a single-family house, as detailed in this BP thread from California:https://www.biggerpockets.com/forums/61/topics/732543-here-is-my-adu-variation-to-brrrr-its-called-bra2xrrDC, Arlington, and Montgomery County have all updated their zoning laws in recent years to broadly permit ADUs within or behind owner-occupied houses.

Then just call any investor currently advertising through PPC in my area.I need to talk to 10-20 people who tell me "they'll never move" or "they'll be carried out of here feet first" or some variation......to find the one who says "what's this about?

I will have to do some research on other cities in San Diego to see if there is any variation in the law.On another note, it was very cool to go through your property portfolio and see your (mostly) buy and hold strategy over time.

I'd like to pose a slight variation on the original question. 

Typically, you will see loan options around 65-75% LTV and borrowers will need to bring 10% of the purchase price plus closing costs to settlement, or some variation of that sort.

They have been so successful that at least 13 states now have them and others have different variations of them. 

There are many variations of such homes.

For NOI there is huge variation on what is included as income and expenses.

There are too many variations that could make this increase or decrease based on project complexity.