Structure CA1 faces to the north of the Ah Canul group, and backs on to structure CA2. It was necessary to build a series of platforms to more or less equalize the level of the building. Thus, there are steps from the west up a level, and then the angle changes and more steps face the south up to the building. Almost nothing remains today save for, most interesting, the lower molding around the sides and the rear comprising short, fat colonnettes in the early Puuc style. CA1 is a later addition to the group, probably dating from 700 CE or even later. It is evident CA1 was a larger structure compared with its neighbour.
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