The entrance (width 1 m) to the building was set in the western side and led east to a narrow corridor (width 1 m) that accessed a small elliptical chamber (L103) and the courtyard to the northwest. The walls of the building, partly preserved 2.2 m high, were constructed from large fieldstones. The entrance to Room 103 consisted of two lintels, over which stone slabs were placed. Room 103 was enclosed by two circular walls (W20, W21). Wall 20, the outer wall, was built of two rows of stones; the springing of a vault, which apparently covered the room, was preserved along the wall’s inner face. A narrow space between W20 and W21 was connected to Room 103 by way of a narrow opening (width c. 0.5 m) in the western side of the room. A floor of small fieldstones (L50) that was set on bedrock abutted Walls 20 and 21. Several worn ribbed potsherds, probably of the Roman period, were discovered in the vicinity of the floor.
The wall enclosing the courtyard (W23; length 35 m, max. width 1.2 m) comprised medium and large fieldstones that were set on bedrock. A floor of small fieldstones, set on a soil fill and large stones (L106), was exposed in the northwestern corner of the courtyard.