In the beginning of the 8th millennium BCE, the people of As,ikli Ho center dot yak dramatically changed how they constructed their buildings. People no longer constructed circular, semi-subterranean residential buildings and instead started to build above ground rectangular buildings. The long-term As,ikli Ho center dot yak excavations help us understand the tempo and organization of this important evolutionary transition. This study advances discussion in three ways: 1) it provides a fine grained understanding of the diachronic shift in social and economic practices, 2) through broad horizontal excavation, this research provides new insights into the built environment, including the opportunity to understand the synchronic organization of residential and non-residential spaces, and 3) this study puts forth a detailed understanding of the evolutionary shift from circular-oval to rectangular architectural practices within a single residential setting. Collectively, the long-term research project at As,ikli Ho center dot yak, with extensive horizontal excavations and detailed radiocarbon dating project, advances our understanding of the changing social and economic context of the transition from circular to rectangular residential buildings.