We have two main issues that I will outline below: HeatingTwo heating systems in the home.

I know conventional lending could become an issue depending on the condition of the property.

Zoning issues?

Requiring a copy of a government-issued ID is a good extra layer of security.

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

Is there any issues with doing this on investment properties that people have had in the past? 

One major issue and they can be wiped out.

I have FAR MORE MANAGEMENT ISSUES because of the SHARED PORCH.  

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.

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.