Pyramid D1 is on the east side of the Group D plaza. The pyramid had three stepped levels erected upon a low base. It faces west towards the plaza and had a single access stairway flanked by sloping balustrades that terminate in vertical sections at the upper extremes. The pyramid was of fine workmanship using well-cut stone slabs. However, itw was poorly preserved and the southern part had partially collapsed. The surviving portions of the building allowed it to be accurately restored by archaeologists.