This was a competition for a Multifunctional pavilion in Vila Franca de Xira. With an exterior volume of 68x45x10 meters, the interior space was modulated with a geometric grid of 5×5 meters. The main ideas behind the proposal consisted in understanding the pavilion as a continuation of the urban park and allowing visual access to the river and an easy connection with the south oriented exterior spaces. We wanted to define a strong architectural reference, a comfortable and attractive space and an efficient and durable structure. The facade facing the river was designed with a stair that could be at the same time an amphitheater, allowing the people to use it in formal events and in the everyday use of the park.