Good Afternoon Rick!
That's doable, if you're up for a little risk. Essentially, you'd be clear of the mortgage +10K upfront, and then you are seller financing the other 100K. You technically are giving a second mortgage for 100K. I don't know all the specifics of the deal you're in, but my gut reaction is that if you're taking this risk, you need to get paid, either in the form of interest or a higher price. Second, definitely get YOUR lawyer to draw up the note/mortgage and any other needed docs, so that you are able to foreclose on the property if there's nonpayment. You either get paid or you get your house back.
Double check that TN, if that's where the property is located, is a quick-foreclosure state. If so, all the better. If not, maybe ask for slightly more interest or fee, knowing that you'll have more time and cost involved if you have to take the property back.
Is the buyer going to pay you monthly payments of 4166.66 for 24 months, or is this a smaller payment with a balloon? Can you verify they will have the cash flow for this? Are they credit-worthy?
Inflation is a consideration right now. Today it sits at 3.5% or so, but that could change. If you aren't at least getting interest that matches inflation, you're not actually getting 100k, but rather slightly less. Knowing that market rates are in the high 6s at best, and much higher most likely, I would be looking for at least 6% interest. Another way to think of it is to look at the opportunity cost. If you had 100k right now and invested it, how much would you have in 2 years?" (T-bills, stock market, other real estate). Then try to get at least that.
If the buyer balks at a higher price or interest rate, you could always have a balloon at the end.
Again, not knowing all the specifics, financing 100k of the price for the buyer is a big ask. Don't be bashful about asking for something in return.