It’s still a worthy strategy to force cash flow that’s rare to find in SoCal, especially if you can reduce the cost of construction by doing a conversion/using an ADU grant or even buying a property with an existing ADU In general, even if the ADU valuation matches your cost including grants, they are usually not worth it in southern CA in single family zones. 

I currently live in San Diego, Ca. but have been looking in the midwest, mainly Iowa, Indiana and Ohio, for properties. 

What's the law in California if I wanted to sell my house.

A bit about me: I’m a real estate investor (my husband and I own a 4plex in Oakland, CA), and SBA loan broker.

In California, where I live, it could take a long time.

I will give you the common-sense answer below, but this is California, where common sense doesn't exist.A mandatory evacuation is outside of your control, so you shouldn't suffer financially because of it.

9) if CA an ADU and JADU can be added to virtually all homes.

I'm not an expert on California law, but I believe you are allowed to give a 60-day notice of termination for a substantial remodel.

CA has the cheapest HML / PML rates in the country basically. 

Where's in CA?