Colonnaded halls are very popular on the east coast. They have benches along the interior walls and in the middle there is a jutting part, either an altar or a throne, which evokes an important personage sitting on it and presiding over a meeting with members of the community. This structure has 19 columns, some of which are double. The roof was not vaulted, but rather is flat, like modern-day ones, which were constructed with wooden beams holding it all together. It was built during the Post Classic period (1200-1650 a.d.).