In the 1980's there were numerous robberies in the area, so I told him to ditch the laundry and collect store rents instead.

@Delbert Standifer Does you collect rent for the back house?

I am currently using Cozy/Aprtments.com for rent collection on my other properties and like the system.  

I have been researching this extensively and I have not found a scenario like this, but please point me in the correct direction if I have overlooked something.

I have a 6 unit building and I'm trying to move away from having to go down to the building monthly to collect rent.

The answer to that will largely dictate where you can put a first floor bath, unless you plan for this to be a more extensive project.

In any event, I'm not concerned about it as I'm collecting a little extra to compensate for the inconvenience of her possibly leaving in the middle of winter or something. 

For investors, this means you can sit back and collect rent.

And, if you have ever attempted to collect from a third party co-signer/guarantor, you would know that it's best to have tenants who can hold their own financially.  

The other thing is you can just hire someone a la carte to do all the marketing, showings, tenant screening, and such and then manage the property month to month (collect rents, field calls).