Platform A5 closes the north side of the Group A plaza. The platform has two levels upon a base and a cornice terminating the walls. The platform faces south towards the plaza and ballcourt. The platform was accessed via four stairways, each with nine steps; they were flanked by steep ramps or balustrades. The visible version of Platform A5 covers the remains of an earlier structure. The earlier building was a large platform with a north-south orientation as opposed to the east-west orientation of Platform A5. The surviving parts were investigated by archaeologists and consist of the north wall and parts of the west facade. The north wall was wide, suggesting that the earlier platform was very large and probably extended south almost as far as the ballcourt. Two funerary urns were excavated from the earlier platform.