Group A is located on the northern end of the ridge. The group was extended during major remodelling work that included the building of the final versions of Platforms A2 and A3 on the north side; this involved building a new retaining wall some further north, east and southeast and filling in the area between the new and old walls to create a greatly expanded terrace. Traces of charcoal at the base of the old retaining wall have been radiocarbon dated to the 13th century, indicating that the expansion of Group A took place no earlier than that.