Tower defense
This building appears to be part of the city walls. It is, however, placed higher than other buildings. It is not connected to the city walls and the battle takes place outside of it. It is therefore more likely that this is the palace.
The only archaeological remains found of the palace are the foundations. These consist of two massive walls filled with soil. The highest point of the walls was 11 meters. The palace resting on these walls must therefore have been a massive structure. It was a palace-fort of the kingdom of Judah, and was located in the center of the mound. It would have given a great view of the surrounding area.