The Residence Palace (?) is the largest building in the “royal complex” and is located facing the garden. On the front facade, facing the garden, a long portico and two towers at the corners of the rear part of the building.
This building faces the garden and measures 76 x 42 m. It includes a central room, the dimensions of which are very close to the room in Palace S (31.10 x 22.10 m). The cover is carried by five rows of six columns. The latter have a square base, 1.14 m on each side, made up of a first two-tone level, made of two slabs, the lower one in black stone, the other white, topped with a second, smaller level in stone. white. We find these two-tone bases in the Borazjan Palace.
The horizontally fluted torus in white stone is of high quality with parallels in Asia Minor, in the temple of Artemis in Ephesus.
Only the first drum of these columns remains. Fragments of painted plaster with a concave shape were found in the room. It is likely that these were mixed columns with a drum for a base, then above a wooden shaft covered with a layer of plaster with a painted decoration of spirals, lozenges or elongated triangles.
On the short sides, large hollow rectangular pillars are still partly in place (the function of which remains enigmatic. Tower base?)
The central room has two huge porticos comprising two rows of twelve and twenty small columns respectively. The bases of the northwest portico are also two-tone.
Unlike the S palace, there are no columns between the two porticos. In the front portico which faces the garden, only one ante is preserved and bears the same inscription (naming Cyrus) as the ante of the S Palace. In the middle of the portico, a short section of the bench that runs along the back wall is raised. Is this the king's seat?
The two porticos which are not placed in the axis, but offset, have preserved up to mid-height 4 jambs bearing a bas-relief. They represent the lower part of a standing figure, in Persian dress, leaving the room. On the dress is visible the inscription, in the third person “ Cyrus, the great king, the Achaemenid ". This inscription makes it possible to evoke Darius, who in his propaganda to justify himself, traced his genealogy to Achaemenes, a mythical king.
