Structure E4 is a platform located behind Pyramid E1 and encloses the eastern side of the Group E plaza. It faces west onto the plaza and has two access stairways, both flanked by ramps built from small slabs of stone and with cornices at the top. The platform walls are of fine workmanship, being built with well-cut and carefully fitted pumice. The front portion of the upper platform was paved with stone slabs, and a bench ran the entire length of the back of the platform. The clay floor between the paving and the bench was found to have been burnt. An offering was excavated from the central axis of the platform's base, it consisted of two ring-shaped clubs placed on either side of a stone ball.