On this platform are located all the buildings explored and consolidated since 1946, which represent so far the site (open to the public). It comprises about 8,000 m2, of which both the south and east façades have been explored, the latter being the main one. According to its orientation towards the east -related to the morning star-, it must have been dedicated to Quetzalcoatl in his invocation of Tlahuizcalpantecuhtli. It is 124 m long and 6 m high and two stairways were found: the first one is large (12.78 m wide, including the alfardas, and 27 steps) and leads directly to the plaza, on which the excavated buildings are located. The southern staircase is smaller (5.77 m wide, including the alfardas), is attached to the large platform and gives access directly to the southern structure.