This project responds to the need of the Pallejà City Council to have a room that meets the conditions for the realisation of cultural or recreational events with the possibility of flexibly adapting to various requirements of use and space. The building has been erected on a plot bounded by Sant Isidre, Pintor Fortuny, Velázquez and Nostra Senyora de Loreto Streets: the latter is an important axis that acts as a link between the new facility, the Molinada Park, the sports centre and the city centre. In this context, it was proposed to arrange the construction in such a way that it formed a public square with a façade and access to the street. It has been located parallel to the street so that the square is closed with the services building, bar and access, with the possibility of making their uses independent. In addition, an underground car park for 100 spaces has been planned, which can be accessed from the lowest level of the plot, on Sant Isidre Street. The enclosure of the room can be compartmentalised with movable partitions or suspended from the armatures, while the enclosure facing the square, glass for the most part, forms a longitudinal gallery that tries to facilitate circulation between the interior and the square and provide transparency from it towards the room. This gallery can also function as a distribution element towards the different rooms if several events take place simultaneously. Inside, movable curtains have been placed along the gallery to be able to darken or to optionally close some of the rooms. A set of retractable stands has been arranged which can also be moved in the longitudinal direction of the room to store them in the final part. The total capacity of the largest room is 798 seats, of which 304 correspond to the bleachers. The equipment has air conditioning given the functional characteristics of the room and the high number of people it can accommodate. The service building that includes the bar, with its own access, can function independently and has storage and a small kitchen. A concierge or locker space has also been included which complements the spaces intended for the management or administration of the room, located at the north end of it. The structure has been made with reinforced concrete pillars in the basement and a metal structure on the ground floor, with armor to cover the 18 metres that the room roughly measures in a transverse direction. The exterior coverings are mostly made of cement board and natural fibers: they form a ventilated façade, with solar protections made with the same material on the west façade. The interior coverings, in addition to the paneling, explain, both on the ceiling and on the walls, the existence of materials with sound-absorbing characteristics. The floor used is continuous terrazzo in the room, with aluminum joint and wooden platform in the access gallery and the bar.