You need to file Form 3115 Application for change in accounting method in order to deduct the depreciation from previous years that you failed to claim. When you are done with that form, you can deduct the missed deprecation on your current year tax return.
You need to determine what the cost of the property is in order to have an amount to calculate the allowable depreciation. You do this my adding to the original cost of the property the cost of improvements you made to it. When you sell the property, you deduct the cost of it less the depreciation allowable to determine the taxable gain. The gain is taxable as capital gain income except for the amount of depreciation, which is taxable as ordinary income but only up to a maximum tax rate of 25% federally.
Here is an article on how to report your back depreciation .
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