But is that the value of the building, or the land that is increasing for yours? My home (building + land) value has gone up a ton due to the housing shortages

But is that the value of the building, or the land that is increasing for yours? My home (building + land) value has gone up a ton due to the housing shortages in tech centers, but on the assessment, the building value has gone down, while the land value has shot up a lot.