Wholesaling a property, not knowing what the equity is.Any ideas?

[Clayton Hepler]

I am about to get a property under contract to wholesale, the owner has no idea how much equity he has. He said that the bank foreclosed on his property a few years back... but he still has it? I want to make sure my buyer is satisfied and not hit with anything broadside. Would this mean that my buyer would inherit the mortgage on the property? How would I find out how much is owed on it?