It's time to take another look at them.Does anyone have any real-world experience with the affiliation/commission side of it? 

However I did note that houses are mostly really old, e.g. 100 years or older... any idea if this poses challenges in things like lead paint presence, outdated wiring, rusty plumbing, etc., or have many of the homes already been updated?   

Quote from @Ritesh Keskar: Just found this old discussion thread.

That should cover the transfer, and I assume that means the tenant isn't paying rent since they would have to be paying it to the old company so you should start the eviction process. 

I get a good laugh when I read  new investors post about buying C/D neighborhood assets liabilities and announce to the world how well they perform in the first few years focused solely on cash flow. 

By observation from a few I've seen in the area:1) Find old guy, hopefully with limited faculties not aware of the market value of his property2) Tell him you love his place and will enjoy owning it and that you're his good buddy who cares about him.3) Offer him at least 10% under FMV and tell him no one else is going to pay that much.   

Im old school...my cpa is in the building next door and I like doing business face to face.

This is why I am here and love the real world experiences and feedbacks.

I’m 30 years old, 10 month old son, juggling taking care of the family, property of 21 acres, an old farm house, work, and real estate.

Typically, structures are grandfathered under old codes and zoning in which case it would be called compliant, but non-conforming.