This is a multi-room building complex oriented E.-W. It has two main architectural phases. The first phase (marked in red in the plan above) includes three rooms in a row, arranged along the east-west axis of the building. Room Γ3, defined by walls α (w. 0.58-0.70 m) and β (w. 0.49-0.67 m) is only partially preserved: its south wall has been destroyed by Drain III and a considerable amount of tumbled stones near its west extremity may have originally belonged to a wall that bordered it on the west (alternatively, this may have been a space open towards the west). Room Γ2 is defined by walls α, β, γ and ζ. It is rectangular, measuring 3.27 m (E-W) x 4.45 m (N-S) and its southwest corner at the junction of walls γ and α has been destroyed by the drain. Room Γ1 measures 6.15 m (E-W) x 4.51 m (N-S) and is defined by walls β, γ, ζ, and η (l. 6.05, w. 0.62); all three walls are deep (seven to nine courses averaging about 1 m. in total height) and wide enough to support a second storey. The defining feature of this room is an oval-shaped hearth, the top surface of which lies at a depth of -0.025; the hearth measures 0.91 x 0.96 x 0.07 m and its top surface is covered with a thin layer of red (Munsell 2.5YR 4/8) clay. The hearth is associated with a thin plaster floor (depth -0.045) that slopes gently to the west and continues in room Γ2. This floor contained LH IIIA1/IIIA2 pottery and was laid on a fill containing a large number of both early and late Mycenaean sherds, animal bones, and small stones. The hearth of room Γ1 is framed by four round flat stones (avg. diam. 0.35 m., depth -0.100 m and -0.094 m), which functioned as bases of the columns that would have held up the ceiling and allowed for an opening to let out the smoke from the hearth.
On top of the floor in room Γ2 extended a layer of rubble marking the destruction of the first phase of the building. In the second phase hearth, column bases, and floor go out of use and room Γ1 is subdivided into three rooms by the shallow walls θ and ι; these two walls are made of only two courses of stones not surpassing a total height of 0.30 m and are built on top of the floor of the room and the two western column bases. Also during this phase a new set of rooms is built and attached to the south part of the building: these are the small rectangular rooms Γ5-Γ7 and room Γ4, the west end of which may have been destroyed by the construction of Drain III and then by fire, as extensive evidence of burning, including burned tumbled stones and burned soil, indicate; alternatively, this may have been a space open to the west.
Overall, it would appear that this complex underwent through two main architectural phases. In the first phase was built the “core” unit Γ1- Γ3, along with rooms Γ10, Γ11, and Γ12 (marked in red in the plan); at a later phase the main hearthroom Γ3 was divided by crosswalls into three smaller spaces and to the main unit were added rooms Γ4-Γ9 (yellow in the plan). The smaller rooms Γ4- Γ7, as well as the spaces created by the crosswalls in room Γ3 appear to have been used for storage, whereas rooms Γ8 and Γ9, from the interior of which start the drains, may have been used for industrial purposes.