I see two separate issues.1.

Also, if it's Lennar, be prepared for problems, insulation issues and therefore paper thin walls. 

I'm noticing a lot of homes with foundation issues. 

I think that's a great approach I have a lot of clients who self manage have no issues at all.  

There are several other issues (undisclosed maintenance markup fees, excessive charges to our account, significant reductions to agreed rent without communication, etc).

If you had no knowledge and they broke the lease I'd issue a notice of non renewal, but give them the option to remove the cats.

. - Just be prepared, because a motivated seller typically has a property with issues you need to be sure you can solve.

I would guess that you have little or no experience running any kind of STR, and now want to get that experience on the back of someone else's investment, with little or no personal skin in the game, and that's not a good way to build an investment portfolio.

She went through a couple brain surgeries and major post issues.

First off, pardon me if I misunderstand things given the limited amount of information I have, but there are 2 things right off the bat just from your description that could be contributing to your issue: 1) a 2nd floor unit - I had a similar setup for a duplex I owned in St.