What you describe is cost segregation, which TurboTax does not support, as that method requires retroactive changes to assets previously reported on filed tax returns. This is a complicated procedure that should be done with the advice of an experienced tax professional.
Your previously filed tax returns will need to be amended or depending on how long ago the building was placed into service. You will likely need to file Form 3115 for a Section 481(a) adjustment (change of accounting method). TurboTax does not include this form. See IRS About Form 3115, Application for Change in Accounting Method.
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