Buying a house without a roof permit

[Zackery Smith]

I'm trying to buy a house 1965 3 bedroom 1 bath on a canal all for 70k. I went and got all the inspections the bank wanted. Now they are saying there was never a permit pulled for a roof the owner put on.the county will not help at all because its over 10 years. The owner is dying of cancer and needs this money for his Falwell trip.(I'm letting him stay there until he dies. I am pulling all the money I have on the down payment and closing so I can't replace the roof. The owner can't pay for a new roof. It sucks because that roof is the in very good condition. Any advice would be helpful!