 Comprises remains of a large basement, about 85 meters wide by 100 long, García Payon found an engraved round stone with a hole in the Center, similar to those embedded at ballgame courts, he assumed it was one, there has not been any further exploration, it is located approximately 500 North of Temple 3, within the urban area.Monumento 17 is in reality a complex.Although García Payón identified it as a "Calmecac" (school and priests residence), is much more likely it actually was the Royal Palace in the city.