Please clarify your question. Why are you trying to deduct expenses? Generally, if you build something, the cost of materials and hired labor (not your own) plus the land because your cost basis.
The taxable gain is the difference between the sale price - sales expenses - cost basis.
The IRS says, "Basis is generally the amount of your capital investment in property for tax purposes."
For more info: Topic No. 703 Basis of Assets
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