I am going to assume where you are and try to answer.
1. The different property at the beginning of the form, line 2 is looking for a legal description of the property.
2. Line 12 is asking for the actual fair market value of the property you sold. The selling price.
Take a look at the actual Form 8824, Like-Kind Exchanges and connect what the program is asking to fill in the form. Use another post of mine to help you through.
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