The spaces of Building A (601-616) are developed in the central and east part of Insula VIII. The building was erected in the Yellow phase of the settlement (EBA ΙΙΙ, 2200-2000 BC) and in it additional constructional sub-phases can be identified, mainly additions and arrangements of openings and of passages of circulation. The composite megaroid building originally opened directly onto a public space, the paved square (103) that was a place of assemblies and a node in the street network. After additions, the building was clearly separated from this square and entry to it was confined by a narrow passage (601-602) that led into the paved court (603) and ended at the antechamber (604) of the basic residential unit of the building, megaron 605. 

The entrance to the megaron is on the south narrow side, with the door pivot preserved intact in its interior and to the right of the person entering. Stone-built benches survive in its southeast and southwest corners, while part of the paved floor –atypical of a roofed space at Poliochne– and stone blocks that were perhaps part of a composite piece of furniture are preserved on its north side. An opening to the northwest of the megaron facilitated access to the ancillary spaces of the building (606-609), which were constructed singly with the megaron and to the west of it. Space 606 may have accommodated a staircase, while in the spaces beyond it (607 & 608) there were enormous storage jars (pithoi). The southernmost of these spaces (609) leads outside the basic building into a narrow open passage (611) and to small rooms inside a second “internal” court (616) between the two buildings (Α & Β), contemporary with each other, of the insula.

Light and air entered the building from street 105 to the east, the passage (611) and the internal court (616) to the west, and from the central court (603) to the south. Measures had been taken for channelling rainwater from the roof and elsewhere along a stone-built conduit running the length of the passage (611) and probably terminating at the well in Square 103.

In its final phase, and as it survives today, the initial building was framed by constructions and spaces that appropriated part of the paved square and the main thoroughfare 105, reducing the public space to the advantage of private property. This “trespassing” on public space might reflect social transformations, laxity or introspection, or express a disposition to manage available space, given that the need for new spaces had increased yet the space of the settlement remained specific. 

In an excavation trench opened outside the megaron the entire sequence of building phases of the settlement and the use of this space for habitation through time were revealed (Poliochne I: 45-72).

Due to its position in the square of the settlement, its size and construction, as well as the finds recovered from its interior, Building A is regarded as one of the most important houses of the Yellow period at Poliochne. One the rarest finds from the Bronze Age in the Aegean, and therefore from Poliochne, is the ivory cylinder-seal of North Syrian type with representation of men and animals, which perhaps belonged to one of the occupants of the megaron. Seals are considered to be objects denoting the status of the possessor but also the authenticity, provenance or acquisition of the object they decorated. This particular seal, made of material not native to the island, perhaps imported as a finished product, object of transaction, exchange, gift or heirloom, stimulates countless and fascinating speculations about its owner(s).