My only suggestion and hope is that you did a thorough walk through with photos or video prior to them moving in.I find that this type of system helps to alleviate some of this craziness that comes your way.

The poured cement walls were ok, it just seemed that the soil around the home would just hold the water.It had a sump pump but I had to run the original 20ft drainage 75ft away from the home to alleviate any hydrostatic dampness still coming up through the floor.

I direct everyone to my website to get more pics, qualification information, a virtual tour, and an application before I even move a muscle.

I would like to start with 3/2 SFH OR small MFHs (ideally duplex) while I gain my REI muscles.

From what I am seeing, I may have to have the town or Police handle this removal as it alleviates a lot legal issues I would have to bare should I do this on my own.  

The city has been cautious and learning some lessons from other metros in their expansions and are currently working on completing a large scale trolly system to help alleviate the current transportation network.

@Colby Mulry this likely won't help your current situation but it might help alleviate future issues.

The ones I can think of are: allergies (other tenants might be allergic)noise (my bird is the noisy one in our household)property damage (yes, the little dog who is from California, pees in the house sometimes..ugh)Fear (my big dog is 110 pound black lab) of Dogs/Cats/AnimalsFear of lawsuits if the animal hurts someone elseI'd like to discuss what can be done to alleviate these and any other objections as much as possible.  

Some buyers want to do nothing and are afraid to pick up a paint brush, so this will help alleviate that. 

Not purely as an investment but also an exercise for my design and construction muscles.