@pryoung Form 3115 allows you to change your accounting method and take depreciation on something that was previously not depreciable. You will have to give valid reasons - using IRS code sections - for why you did not depreciate the rental real estate and request that you be allowed to depreciate it going forward.
If you have no reason for not depreciating something except for the whole "I forgot" then the rule is you can go back three years and amend your tax returns and add the depreciation in (that means that you have until April 15 to file your 2018 return). Any depreciation older than that (the first six years, in this case) is lost. If you enter the value of the property into TurboTax and the date that the property was placed in service then TurboTax will calculate the prior depreciation for you so that you don't have to.
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