When I got my commission, I bought a new pair of shoes, and put the rest in the bank.

Stepping into the shoes of a landlord is tough.  

Put the big stuff in storage, sign a short-term lease on the smallest place you can tolerate and start laying out your world domination plan.  

I do not want to do any property rehabs...What would you do if you were in my shoes?

But it would just have been the former owner in his shoes coming after you.Have you looked through your deeds and paperwork to see if there was some sort of easement for the encroachment?  

Offer to rent a truck and pay for a month or two of storage unit rent while they stay with family or friends.

I would like to eventually own at least one storage unit facility.

I'm speaking on what I would do if I were in your shoes and this all depends on if you're capable of paying or not and if the landlord isn't actively trying to solve this for you.

The end buyer has stepped into your shoes, in the original contract.  

My other thoughst would be steel warehouse / workshop space, or self storage.