What if you're a cardiologist with no debt and making $250,000 annually?

I have purchased the following books:ABCs of Buying Rental Property The ABCs of Property Management The ABCs of Real Estate Investing The Advanced Guide to Real Estate InvestingThe Book on Investing in Real Estate wit...

When its included in a lease for real estate then the laws pertaining to residential rental security deposits in your state apply but when its separate you should have more leeway to get some additional deposit to protect you.

of those I like next door best because it is hard to fake and the reviews are easily tied to a reviewer in your community.The costs of ADUs vary significantly for various reasons including by ground up vs conversion, difficulty with lot (sloes, access, etc), finishes, and even the size (bigger typically have lower PSF).Good luck

With rainy day funds included there are reports that CA had over $20B surplus. 

That's before you pay any debt service.To answer your question: No, it's generally not a good idea to lose a bunch of money every month.

Many coaching programs include group sessions, masterminds, or events where you can connect with other like-minded investors.

Consider lease optioning the “now keeper” and walking the created debt forward if you lease option buyer can cash you out. 

Eliminate debt, establish a budget, and save.

Im self employed, roughly make $130k gross anually, 1099 NEC , no debt at all, 740 credit score.