On the highest point of the valley is located El Palacio, a group of at least seven buildings that are distributed on two levels and went through different stages of construction. The earliest stages are located on the highest part of the hill and do not belong to Puuc architecture. Later, in this same sector, a patio was built, already with Puuc architecture, which must have housed the first ruling lineages of the site.

In the following period, the Mayas attached to the hill an enormous platform of about 150 m long and 70 m wide, on which they built 40 enclosures, most of them attached to the hill. During the Terminal Classic period, El Palacio was the seat of political and religious power. However, the construction of the Palace was never completed, since in the eastern sector a series of unfinished rooms can be seen.