It is made up of 13 structures of various sizes and different functions, distributed around four civic-ceremonial plazas. However, it should be noted that there were never more than six or seven of these constructions at the same time. All the buildings of the architectural complex have been explored and, most of them, have been fully restored.

Building D5-2: It is the one with the best construction quality. It has three autonomous rooms with vaulted ceilings and ornamentation on both sides of the central door. The architecture and decoration suggest another elite residence.

Building D5-5: To the north of Plaza A is located building D5-5, which corresponds to the Early Classic. It is actually a 10 m high substructure formed by a pyramidal base and topped by a temple, which is reached by a staircase with two landings on its south façade. The upper façade of the temple is a very old zoomorphic doorway, since it is possible to appreciate two oval and stucco-covered recesses that are interpreted as a pair of eyes. In the interior two tombs belonging to high rank personages were detected, which denotes the cult to the dead rulers.

Building D5-10: Building D5-10 is located on the eastern side of Plaza A. The main façade faces Plaza B, which it delimits to the south. It is the second most important building of the South Group. It was built and abandoned during the Early Classic. It has a single room that was once roofed with a vault, but still retains the main access in the center of the north façade, as well as a secondary access in the rear wall. The presence of a bench or bed inside the room suggests that it functioned as a residence for the local elite. At the front there are four masonry pillars that suggest a huano palm or grass roof.

It shows a considerable increase in the volume of the structures. Here there are three plazas with a series of buildings around them, many of them monumental. However, the works of exploration and restoration of this architectural complex have been concentrated around Plaza B. Although there is evidence of ceramics, whose antiquity goes back to the Preclassic period, that is to say, before the year 250, it is known that the important occupation of the Central Group of Balamkú begins between the years 250 and 450, and ends towards the Terminal Classic, that is to say, around the year 1000 of our era.

Structure I: It went through several construction stages. The first was a palace with a lavish decoration in a frieze modeled in stucco that dates back to the end of the Early Classic, but it was covered and today it is a substructure. Later, throughout the Late Classic period, it was modified until it consisted of three pyramidal bases with staggered bodies joined together and topped by an upper temple, each with a main staircase on the south façade. Originally, the basements were built independently. For their study, they were denominated as follows: structure I-A to the west end, I-B to the center and I-C to the east end. Throughout the Late Classic and Terminal periods, structure I-A was built first, followed by I-C and, finally, I-B, which ended up joining them all together. Once united, the three pyramids seem to perform an astronomical function similar to that of other groups of buildings in important Mayan cities such as Uaxactún, Tikal and Calakmul. At the end of the Classic period, Balamkú received more influence from the Río Bec region than from the Petén.

Substructure I: Below foundation I-A there is a substructure of an earlier construction stage. This structure has a frieze modeled in stucco, which gave its name to the site due to its decoration with jaguar features. Substructure I dates from the end of the Early Classic or beginning of the Late Classic (550-600). It is a palace built on a rectangular base with rounded and smooth corners and edges.

Structure IV-B: It is located south of the same plaza. It is also partially intervened. In it it is possible to clearly identify the rounded corners and the stairways with alfardas with characteristics of Río Bec.