If you own the building and are using it for your business then it is an asset of your business. If you are reporting the business as part of your personal return the section is Self-Employment. When you are filling out the information here there is a section to add assets for your business.
As you look at the list of expenses there is a box by Assets click on that box and then when you continue TurboTax will walk you through adding the asset.
Link on reporting Income and Expenses for Self-Employment Business
If you own the building and are renting the building to another business then the income and expenses are part of the Rentals, Royalties, and Farms section of TurboTax. In this section, you would add the building as an asset.
Link on how to report Tax Deductions in TurboTax
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