Liens may have been wiped out in the foreclosure depending on the laws of your state, or there may be a limit to how much the HOA can charge after a foreclosure. 

I second @James Carlson has great info on investing, the laws leave it wide open for Airbnb. 

You'll want to validate your assumptions and firm up some of your numbers before you are on the "official" due diligence clock. 

I know Tim Claxton as well and also do some work with that firm. 

You need to be firm when you buy a house and have it inspected. 

But California law limits the reasons for landlord entry. 

Some interpret local laws differently than others and an investor friendly attorney may be more likely to give you the specific route to take rather than just  a general idea. 

I firmly believe that the lease is a contractual agreement that must be respected on both sides.

My firm handles hundreds of tax lien foreclosures in Ohio.  

I grew up living in a "house hacking" family, meaning we would move house to house rehabbing and living in the construction zone, and last year I worked with my brother in law on a few rehab/flip projects he has.