Tenants with problem pets such as Pit Bulls, Rottweiler's, etc.I would ask the current owner to get you a 5 year claim history of the building.

@Wayne Brooks The backstory: The previous owner purchased two duplexes with both properties next door to one another in which one of them was the one I own now.It's has been a challenging scenario to follow the history of the conveyance but from what I can comprehend two owners ago their was a slight discrepancy .

Stick to the things that matter, credit history, eviction history, income verification.

I have a potential tenant lined up that is asking for a copy of their credit report that I pulled.

Almost half of my portfolio has Section 8 tenants in it and as non section 8 people move out i try to move in more Section 8 tenants but i make sure my property manager screens them THOROUGHLY....not with just what's on paper regarding credit report, income and past criminal activity (If any).....I make sure my PM screens to make sure they have no pets, no evictions, no smoking OF ANY KIND and no felonies and we still get TONS of people calling...the biggest problem becomes picking someone from who is left.   

If they're on disability and don't have a job or a large volunteer commitment and they're not obviously physically disabled, get a full confidentiality release of their mental health history so you can determine if you can cope with having them as a tenant. 

Then work on getting some more rentals (maybe even get an asset based line of credit using this paid off property - the note itself will act as a deterrent) and build more wealth before spending time and resources on LLC.Here is another "rule" - the "2% ASSPRO or CYA rule" - the cost of setting up and maintaining your asset protection should be less than 2% of equity you are trying to protect.

This distinction if of course most important when you need to use cash out proceeds to pay down credit cards used for rehab or keep the ball rolling and re invest for more flips/investments.  

I have already discovered they don't answer their phone, don't have website account access and don't take credit cards.  

I have pretty good credit and no debt currently.