Tax Lien stuff seems like an interesting thing to try out.

I plan to have stuff there that adults want to do.

I have a few STR and this is what my accountant recommended.Basically rent the properties to the S-Corp (NNN lease) and have it handle all the STR stuff.

I haven't had the problem but can't deny its been a question of what can I do to protect myself from this type of stuff.

There is a ton of free information on this site that is worth way more than the stuff you could otherwise buy. 

I pretty much self manage and have a good team of handymen working but down the road my goal is to move more to true passive stuff. 

Even the decrease in 10% rent can have adverse effect on cashflow.I am also open to do a cosmetic repair where I can improve some of the stuff to compete with newer homes in the area (say granite countertops and stainless steel newer appliances).

Generally speaking, good to send mail to the unit saying that they have till X date to get stuff out. 

It's really hard to find stuff now that cash flows well right from the start. 

Expense is most other stuff.