You will need to put your percentage of ownership in Part II (Seller Info).
Then, in Part VI, you will use your portion of the selling price, selling expenses, cost basis, etc.
As for what the cost basis is, it's everything you paid to become the owner of the property: your portion of the loan repayment, foreclosure fees, title fees, improvements, etc. Even property taxes could be part of it if you didn't deduct them on your prior year tax returns.
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