In southern CA, even garage conversion ADU additions are typically costing more than the value added.  

Additionally, I'm still not convinced that you are not associated with this new management company. 

You also get 100 free credits on sign up so great if you just need a smaller list done. 

When it comes to housing, the FHA rules apply in addition to those of your state/city.

Use extended closing periods or additional earnest to buy more time for your old property to sell if you need.The last option is what's called a reverse exchange.

These are professionals with additional training and a stricter code of ethics.

Continue with a viewing, additional questions, get applications, run ALL checks, and then make a decision.By being very clear about requirements, you will catch most early in the process and can let them know.

Look at it more like a credit card.

Close to a cool little town, close to an area attraction, etc....Also do a search here and see how to screen guests, in addition to what the hosting sites do.... like no last minute bookings, no short stays....

My biggest concern is managing additional units and tenants.