If you sell, you'd just pay off whatever balance was owed at the time of the sale, the same way you would with conventional financing.If it cash flows for you while providing income for him, I think it's a win/win. 

They are a nationwide furnished apartment provider. 

You will also provide your "client" with a statement that shows the rental income the property received along with the associated expenses you paid before sweeping the money over.The Operating account of the Mgmt fee now has Property Management Revenue. 

My parents are interested in supporting me and they are at a stage where they have a comfortable amount of money, they have excellent credit and they have no plans of taking out a loan in their lifetime. 

You don’t include the principal payoff that your guests are providing nor the property appreciation.

You may find that it provides that her coverage continues so long as she holds an interest in the property, including holding a purchase money mortgage securing a portion of the purchase price of her sale to a third party so a new lender's policy may not be needed. 

Would you be able to provide what you use in another form.

I'm always happy to provide any insight I can for new investors. 

At OfferMarket, we call this a Fix and Rent loan which is a bundle to provide savings.

If they are month to month, you can purchase the property, provide 60 days notice and have them vacate in order to rehab and bring rents up to market rate.