More on my first investment, this quadplex is a fixer-upper and has the potential to add 200k+ in equity with about half as much invested.

Alternatively, you could potentially try posting about their swap opportunity on facebook groups or a simple google search of Home Swap websites could also yield results.

One of the risks here is that you can potentially have a nosey/disgruntled neighbor who would go as far as to file a complaint with the local building department.

Your loan probably technically doesn't allow this because there is a "due on sale clause" but I have never heard of a loan being called as long as it's being paid My advice to you would be to screen potential property managers, read reviews then set it up to be managed by them. 

It does not hurt.

You might also meet someone that could be a potential business partner.

Sadly the home was badly damaged in a fire, fortunately nobody was hurt.  

Potentially fix and flips.

We have a potential deal in the works that has a business on the first floor and apartment upstairs. 

HOA fees for a condo can be expensive that hurt your bottom line.