The Postclassic site extended approximately 264 hectares, covering portions of the valley floor, the majority of the Cerro Tenismo hill, and portions of a smaller hill to the east. All of the major monumental architecture at the site was built during this period. Unlike many Postclassic Mesoamerican cities, which usually have a single central group of monumental architecture, the large structures at Calixtlahuaca are split into multiple smaller architectural groups scattered from the valley floor to the summit of the hill. The areas between the monumental groups were filled in with a mixture of commoner houses and agricultural terraces. East of the main structure, is a hallway (south-north) at the southeast corner, it contains embedded three petroglyphs (see below gallery with composite pictures of petroglyphs).
Monument 10 and 11 Not explored, located higher up on the hill side.
Monument 13, 14 and 15 Not explored, located higher up on the hill side.
Monument 16 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.
Monument 17 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. It has the same type of other Aztec palaces (Evans 2004; Smith 2005a). Altogether it has 32 rooms, an original adobe wall, and three different stages of construction. It has interior corridors and access stairs to different levels. To the visitor eyes, the complex can be divided into four main parts, a residential area on the south side of the complex, a ceremonial area with a temple or main basement, a wide plaza in front and bases on the West side area.
Residential area This area can be subdivided into two sub-areas, divided (east and west) by the adobe wall, it is believed to have been built during the last Mexica occupation, in the late postclassical period. It has three entrances, one from the West, with communication corridors to the various areas and access to the private housing compound, which has a series of rooms around an internal private patio. This area has another access from the southeast corner of the site. A third entrance provides northern access, to the ceremonial area or the main square.
Rooms The main features of all rooms are: All rooms had stuccoed floors, built over gravel placed on a compacted fill surface, see photographs. Every room had a square sunken hole, with charcoal remains, that probably were used for heating, cooking or burning ritual
Copal.
Private quarters Probably the royal residence of the main city governor, consists of 7 rooms around a private patio and private access, also possibly guards rooms. The rooms are of different sizes and certainly different uses.
Main temple This basement has a ceremonial plaza characteristics, has three stairways to access the top, divided by smooth slopped wall sections (alfardas). The center, without a doubt the most important access is approximately 10 meters wide, lateral stairways are 6 meters. It is thought that there were at least three temples at the top. Remains of a stuccoed floor can be seen on top. This building has a "Probe" or exploration entrance made by archaeologists on the north side, showing three constructive stages. (See Picture) It has been confirmed in this temple, that there are no secret chambers or tombs, as is normal in similar temples in the Mexico Highlands.
Western side structures On the west side of the plaza, in front of the main temple, is a series of basements, with remains of constructions, a stair called “K” by García Payón and two beautiful slope-panel constructions, Teotihuacan style. ==Objects found==