Contribute to HSA the maximum you can, then invest to get the best possible returns and wait.

You can check the county records and then public information to verify those names, phone numbers & emails.

If you did the cleaning and repairs, you aren't going to be able to charge for your time. 

If your current tenants lease is coming to and end and you are simply getting a new tenant. then you will just want to get a fresh lease going.If your lease term is still on going, this tenant is leaving and someone else if coming to rent the unit in their place, then its really up to you.

Wondering how to go about getting this done. 

Is this lender going to sending money back, as second mortgages to ODC/Disrupt deals?

I feel that the QBO is the only way to go for me, as I am remote from my Accountant and Bookkeeper. 

You’re not going to find a safe way to do what you want unless you or the “buyer” has enough cash to pay off the note. 

Why are you losing money just to keep this guy?

Are you looking to grow locally, out-of-state or no preference?