It is located on the south side of the Central Plaza, attached to the first two bodies on the east side of "El Castillo de Kukulcán", it received this name because, when excavated, fragments of mural painting were found on both sides of the central wall in the shape of an “L ”.

It is a colonnaded corridor set on a low platform, with a bench along its north side and a small altar in the central part. The murals have a red background and a green border, the scene consists of red and yellow frames that enclose two characters in profile richly attired and painted red and yellow on a blue background, the characters hold with their hands a circular banner that shows representations of solar symbols.

These pictorial manifestations show the cultural contacts between Mayapán and other cities of the Mexican Altiplano in the Postclassic Maya period.