The Terrace Building (TB) Complex incorporates eight nearly identical units and spans more than 100 meters on the northwest-southeast axis of the Citadel.  The dry laid masonry walls are composed of two roughly squared ashlar stone veneers of local limestone, siltstone and sandstone with a rubble core of stone and clay/silt debris. The Phrygian builders likely installed wooden timbers as leveling courses within the masonry walls and as vertical support posts for the roof and inner galleries.  The extant walls currently maintain a maximum of four courses and stand approximately 1-1.5 meters in height.

General Condition

The deteriorated condition of the Terrace Building masonry partially results from the catastrophic ninth-century BCE fire.  The collapse of the roof and burning of timber caused an outward rotation of the two wall veneers, which separated the wythes and compacted the rubble core.  More recently, full exposure to the harsh Anatolian climate following the 1950s excavations has contributed to further damage.  Freeze/thaw cycling has caused numerous fire-damaged stones to crack and disintegrate, and seismic activity has produced structural instabilities.  As a consequence, the outward splaying of veneer walls increased.