@Kris Russell I filled two of my units in the last 3 weeks BUT my market has almost no supply and extremely high demand so it depends on your local market.

Learn the 6 CA ADU regulations at least enough to know them at a high level. learn the costs of ADUs.

I can't post the link due to BP regulations but if you search my name the video is called "8 Steps for Buying a House."

And to jump on this bandwagon, you should determine that BEFORE the question is ever asked.Find out if your City or State has any regulation on this.

How low it goes depends on market as well as supply and demand.

A private loan might come from a friend, a business, a family member.Hard Money - is a business that operates to lend money but is considered a non-bank since they can set their own guidelines and do not operate under the same regulations as a mortgage company or bank (wells fargo or B of A) would. 

If you can find supply.

Values are tied directly to supply, demand and interest rates.

@Tyler Munroe are there Airbnb regulations or restrictions in Revere?

I would first figure out why the current owner wants to sell, why is he/she jumping ship (too much maintenance, upcoming STR regulations, poor returns, etc.).