Urban design of the Middle Formative period

During the Middle Formative period they expanded Allpacoto urban center with a new spatial organization; buildings were distributed around two open public spaces.

The main public space was surrounded by Major Public Pyramidal buildings, B2 and C1, and the Minor Public Pyramidal buildings, D1, D2, E1 and E2. Another public space was located to the west of the first one, defined by Minor Public buildings F2 and G.

North of the Major Public Pyramidal Building B2 they built the Residential sub-complex B1. Furthermore, north of the Major Public Pyramidal Building they located the Minor Public building C4 (Los Frisos -The Friezes building), with decorated external walls, and Minor Public Buildings C5, C6 and C7.