Continuing excavations have contributed to our interpretation of the reuse of the 11-12th century Wallace Chaco great house in the 13th century. Work has concentrated on its central portion and the western elevated kiva, which is where the 13th century reuse of the building is architecturally most apparent. This has also allowed for better understanding of the establishment and use of Wallace Great House in the mid to late 11th century. Results have strengthened the hypothesis of a reformulation of a Bonito House Society in the early 13th century that includes ancestor veneration. This presentation focuses upon the architectural evidence though other key findings will be mentioned.