The two buildings are the largest structures standing during the 10th-century BC to have been found in the territory of the Kingdom of Judah.
Two royal public buildings were uncovered by researchers of the Hebrew University and the Israel Antiquities Authority at Khirbet Qeiyafa - a fortified city in Judah dating to the time of King David and identified with the biblical city of Shaarayim.
One of the buildings was identified by the researchers, Professor Yossi Garfinkel and Saar Ganor as David's palace, and the other structure served as an enormous royal storeroom.
They said the southern part of a large palace that extended across an area of 1,000 square metre was revealed at the top of the city.
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The wall enclosing the palace is 30 metres long and an impressive entrance is fixed in it through which one descended to the southern gate of the city, opposite the Valley of Elah.
Around the palace's perimeter were rooms in which various installations were found - evidence of a metal industry, special pottery vessels and fragments of alabaster vessels that were imported from Egypt, archaeologists said.
Much of this palace was destroyed around 1,400 years later when a fortified farmhouse was built there in the Byzantine period, archaeologists said.
A pillared building 15 metres long by 6 metres wide was exposed in the north of the city, which was used as an administrative storeroom, they said.