It's both. It's the sale of inherited property. Since you inherited your share, your cost basis in the lease is equal to the Fair Market Value of the lease at the time of her death. Hopefully, you can find some reasonable way to determine what that value would have been. If not, you'd have to use zero.
When you sell the lease, you pay long term capital gains tax on the difference between the sales price and your cost basis. This can be reported in TurboTax under Investment income, in Stocks, Mutual Funds, Bonds, Other. Say that you inherited the property on the date of her death, and continue with the screens.
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