You can use the same Form 3115 for the two properties.
In general, you can only make a change in accounting method to catch-up on missed depreciation or change depreciation that was calculated incorrectly.
Note: Form 3115 can’t be used for making a late section 179 election, changing the date an asset was placed in service, or changing the use of an asset.
Form 3115 is a multi-page form, but the part that pertains to catch-up depreciation is found on page 8, Schedule E - Change in Depreciation or Amortization. In Part I(a), the DCN code is “7” to indicate a change in the depreciation method from an impermissible method to a permissible one. You also need to complete the Information for All Requests on pages 1 to 3.
You can only prepare Form 3115 in TurboTax Desktop, and you must be in the Forms Mode to prepare.
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