The level of Land is based on how long it has been staked. The longer a Land is staked, the higher its level. The Land's level determines the maximum fee that a Landowner can charge as well as the rewards the Landowner receives.
To access information about your owned land in Hivemind, you can navigate to the Lands tab. If you're specifically searching for details about a particular Land, you can simply enter its Land # or the Landowner's name into the search bar located at the top left corner of the Hivemind dashboard.