@jp_19501
in your case, the FMV in box C is the FMV of the donation, which in your case means the difference in appraised values with and without the easement. You should list your actual cost basis, which is the fair market value of the inherited portion on the date the previous owner died plus the purchase price of the portions you purchased. It will not affect your deduction if the appraised value of the donation is more than your basis.
