This building is thus called because of the fragmented murals discovered within it, which were painted with vivid colors of red, blue, ochre and black, and was covered with geometric motifs, stepped lines, Grecian frets, spirals, etc. This building had a vaulted roof and was used for ceremonial purposes. In its interior, there were altars and benches used for placing offerings and holding certain kids of ceremonies. The Murals Structure has only one construction period which dates to the Post Classic period (1200-1650 a.d.).