I suppose getting a contractor on-site is the most responsible route for due dilligence, just don't want to waste time for everyone involved if this is fantasy land.

If it was just more income, that's not bad, but if it was for special cleaning and maintenance because of the pet, perhaps with no further pets living there, you could inspect for and mitigate any potential pet concerns.Thinking about carpet and paint repairs in some areas and such.After my last dog died, it took a while before I saw where he rubbed up on certain walls and doors.

If multiple story, look at the walls and see if any fell. 

Come to find out it was a false wall, so we punched a hole through it and in the center of the room was a coffin with a certain symbol carved in the top of it, I will leave out the symbol for sake of causing arguments. 

Badly qualified applicants don't want to waste their money, so they "self screen". 

Like @Jaron Walling mentioned, have you looked into starting an LLC now that you have scaled up a bit?

I put on solar panels on my last property, huge waste of money, I would of profited much more if I didn't.

Notes which may be helpfulHaving this list of questions can make the answers I get back precise, and efficient, so that the callers time is not wasted. 

Hope I didn't waste to much of your time..

We recently purchased a 100 year old duplex with plaster walls and ceilings.