I second everything @Christopher Telles says. I realize that this wasn't what you were asking, but best way to proceed (based on the information you provided) is to pull the plug on the "deal" and get back to research. Relying on Zillow for pricing is just one of many red flags here. Do you have a previous relationship with this realtor? Why does the seller care about LTV? It should only matter to the seller if LTV is 0% and you can close immediately. I have other concerns but I'll stop there for now. For your sake, I'd like you to explain more about the deal before you write any checks.