In order to preserve as much of the original substance as possible, careful excavation aims to uncover just enough of the buildings to gain insights into its use-life. Conservation and preservation efforts have been considered from the very beginning of excavations, including the construction of provisional roof structures. Meanwhile, two permanent shelters have been constructed. These new shelters provide better protection from environmental conditions. Further, in the case of the shelter at the Main Excavation Area/Southeast-Hollow, it greatly improves visitor access and visibility of the excavations and prehistoric monumental buildings.