TurboTax should not reduce the basis based on the days in service. Did you take a residential energy credit for your condo?
The following entries can reduce your basis in a property. but that seems like the most likely culprit since we know you haven't taken any depreciation prior to this year:
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Section 179 deduction.
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Nontaxable corporate distributions.
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Deductions previously allowed (or allowable) for amortization, depreciation, and depletion.
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Exclusion of subsidies for energy conservation measures.
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Certain vehicle credits.
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Residential energy credits.
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Postponed gain from sale of home.
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Investment credit (part or all) taken.
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Casualty and theft losses and insurance reimbursement.
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Certain canceled debt excluded from income.
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Rebates treated as adjustments to the sales price.
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Easements.
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Gas-guzzler tax.
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Adoption tax benefits.
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Credit for employer-provided child care.
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Partial disposition of MACRS property, whether you elect to recognize the partial disposition or are required to recognize it.
