When you inherit something its cost basis is the value that it had at the date of death of the person that you inherited it from (or exactly six months later if that value is higher). If what you inherited - and then sold - was in this case a co-op as well as co-op shares then the cost basis that you enter (and the description of the sale) should include the value of the co-op shares.
If there is no 1099-S sent to you then you need to use the closing statement as well as whatever documents you have to show the value at the date of death in order to prepare the return. Be certain to keep these documents in case the IRS questions your valuation of the property.
When you're entering this sale in to TurboTax you'll enter the type of investment as "Other" and then enter "I inherited it" when asked how you received it. Make sure to add the co-op shares as part of the description of the property.
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