Structure 13 (also known as Palace 13) is located in the northern part of Group A. Archaeologists uncovered three construction phases with the later two dating to the Late Classic and the earliest dated to the Early Classic. The oldest remains found consist of a high wall with a stucco floor at its base. The whole west side of this Early Classic substructure was destroyed when the next phase of the building was erected in the Late Classic. This consisted of a high platform facing east onto a small plaza and reached by a low stairway. The plaza was surfaced with stucco. The last construction phase replaced the previous 3-step stairway with a higher 6-step stairway. Opposite the stairway was a bench with a niche.