This architectural complex is to the north of the Pyramid of the Niches, and is made up of an elevated terrace where several administrative and residential buildings are deployed, where meetings were held, perhaps of the ruling elite. In this place is the Building I that conserves mural painting in all its walls and sidewalks. The painting represents fretwork and scenes with anthropomorphic characters in a seated position, as if they were the representation of a ruler or priest, each framed by a series of fretwork and scrolls in obvious allusion to the elements of nature, such as water and wind.  The colors blue, red and yellow stand out in the painting. This particular building is an indication that the city was painted in its entirety.