Charlie, be very careful about owner financing. It can be good but if the owner gets into trouble you might lose your money and your shop. It happened to us, almost.
Lots of years ago we were a young family and wanted to buy our first home. There was a local business man who we knew and he sold us a fixer upper that he financed for 10 years. We remodeled it and treated it as our own, and paid him faithfully for 5 years. One day a banker we knew said he would pay off the house and finance the balance through a bank loan and give us some cash to finish remodelling it.
As he was processing the paperwork to approve the loan he called me with bad news. The guy who was financing it for us got into financial trouble with a trailer park he owned and the bank had put a lein on everything he owned, and technically, he still owed our house !
We had a lein on our home for 2 years and never even knew about it.
Long story short, we almost lost everything we had in the house and the only thing that saved us was the bank agreed to release the lein on our property only if the first guy would guarantee the payoff money would be set in escrow until the suit against him was settled. At first he refused to do it but I went to his business and threatened to choke him unless he got us out of his problems. He did sign and we were able to get a bank loan.
Sorry for the long story, but when you are relying on an individual to finance something you have no protection in case they go belly up or die or something else like that. Just thought I should mention it. Go see a lawyer and get his advice to protect yourself before you sign anything. You could pay it all off and never see title to the property. A lot can happen in 5 years, a messy divorce for him, a lawsuit, etc.
Don