While going through the sale, it shows the cost of the house with no land value. This is fine at this point since you are changing things.
You will need to input the total depreciation taken over the 40 years versus what the program knows. The program will ask you to confirm your depreciation, enter the correct amount. The program will accept what you enter.
I agree with Carl that this situation is exceptional and you will have quite the tax bill. You have no basis and should amend returns.
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