Yes, you will have to file Form 3115. You can not go back that many years to add the depreciation.
Unfortunately the depreciation recapture is "allowed or allowable" meaning even if you never depreciated it, you would still have to recapture the depreciation. Depreciation taken would be on line 18 of Schedule E.
One solution is to elect an accounting method change and file a Form 3115 in the current year and take the prior depreciation as a section 481(a) adjustment. [land value is separated, land is not depreciated]
Below are the IRS links related to the change in accounting method. TurboTax does not have that form.
May be these will help
Form 3115, Application for Change in Accounting Method
Form 3115
Instructions for Form 3115 (03/2012)
Instructions
Form 3115,
PDF
@Chris1037101
