You would probably use a General Journal entry to do this.  However, you should probably talk to your accountant first to figure out what entries are actually needed.... with rare exceptions, the fixed asset accounts only get entries (a) when you buy an asset, (b) when you sell an asset, and (c) annual entries to the 'accumulated amortization' accounts.

...and there is no 'accumulated amortization' on Land. It is known that the value of land rarely depreciates.