It is divided into three units with patios delimited by galleries, porticoes and pyramidal bases. Between the third unit and the Sunken Patio is the Ramp of the Animals, covered by slabs carved with the representation of different zoomorphic motifs.

Animal Ramp Unique in Mesoamerica, it shows tombstones individually decorated with representations of animals such as birds, snakes, butterflies and several mammals. Its function, as an element of communication, was connected to the different levels of terraces. It consists of 271 slabs and it is considered that these slabs belonged to another building dedicated to the study of these animals.

Temple of the Architects It is located 3.70 m below the level of the terrace, which indicates that access was through the roof of the rooms on the west side, from where a staircase descended to a central patio. Around the patio there are several rooms. In this area were found several masonry instruments, and plumb bobs.