You deduct the cost of your building and the key building systems over time, through depreciation. Enter the cost of the building and each of key building systems as Assets in the section Federal>>Deductions>>Depreciation of Assets. While you are entering the assets, TurboTax will advise you of any options you have to increase your depreciation deduction in 2019.
Note that the IRS requires the building and its structural components to be depreciated separately from the key building systems within that building. The key building systems are the plumbing system, electrical system, HVAC system, elevator system, escalator system, fire protection and alarm system, gas distribution system, and the security system.
See the IRS website at this link for a summary of the IRS regulations for your building, and see IRS Publication 946 at this link for the complete IRS rules on depreciation.
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