It is the most important building of the site. It has a rectangular floor plan (28 m from north to south and 18 m from east to west) and was built with large quarry blocks. Two monolithic tubs were found inside, possibly used for ritual baths. The water supply and control were achieved thanks to a complicated drainage system. It is probable that the most important ceremonies, reserved for high ranking personalities, took place there.

Monolithic tubs: View of the tubs, made of pink quarry stone.