A more thorough explanation:

LAND OFFICE

A land office is a government office that records the sales of public land.

1. John went to the land office to purchase a piece of land for his farm.

2. The land office keeps track of all the sales of public land in the state.

The examples illustrate how the land office is responsible for recording the sales of public land. In example 1, John goes to the land office to purchase land, which means the land office will record the sale. In example 2, the land office keeps track of all sales of public land in the state, which shows how important the land office is in managing public land sales.