In response to question 3, the cost basis should be shown on your Depreciation Detail report. If you were using TurboTax in prior years you should be able to see the "Cost Basis" since they would be listed on the detailed report that supports Form 4562. Your prior years' improvements should have been depreciated or expensed in the year of the improvements. If these were expensed then they would not be added to your Cost Basis since already expensed. If depreciated, then you would add these to the Cost Basis (see detailed depreciation report).
If you did not use TurboTax in the prior year then you would need to get this information.
Both Form 4562 and the depreciation schedule are included when you print your return. If you are using the online version, you must pay before you can see your forms. If you have the desktop version, click on Forms Mode in the upper right corner.
Your gain or loss for tax purposes is determined by subtracting your property's adjusted basis (Cost -Depreciation) on the date of sale from the sales price you receive (plus sales expenses, such as real estate commissions).
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