There are several expenses that are deductible in a 1031 exchange and several that are not It seems to me that - based on your numbers - you increased the basis by the 51K and then reduced it by taking four years of depreciation. So that left you a 23K increase after the four years.
But there may be other explanations. TurboTax should have added the allowable expenses to your depreciable basis. I would be very hesitant to try and take a 51K expense that I didn't have a record of without getting proof that you didn't already take it.
@curtjenny
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