It delimits the south side of the main square associated with the Palace. It has a wide staircase that provides access to 14 rooms that were once roofed with a false arch. There is also a complementary staircase on the west side of the building. All the rooms are distributed in pairs, with access only from the south side. The central room has a single entrance, but the three on each side have triple entrances formed by masonry columns. This type of columns, covered with well-cut ashlars, is one of the typical elements of Chenes architecture. The same can be said of the pair of embedded columns that decorate the west side of the building. Some rooms have wide masonry benches that were used to rest or to spend the night. In the interior walls, close to the entrance, it is common to find small holes or “curtain rails” that were used to tie cords to hang elements (fabrics, skins, mats) that attenuated the passage of light. Evidently, these were living spaces for high-ranking individuals.