The new reception pavilion of Quebecois National Assembly and the expansion of the inner courtyard serve to modernize the heritage site and grant citizens access to a bold and impressive learning space. Discreet from the exterior, the reception pavilion will be built underground, beneath the Parliament Building's facade. The entrance will seamlessly integrate into the existing architecture, below the monumental staircase, thus respecting the Parliament Building as the symbol of Quebecois identity and preserving the iconography and layout of the Parliament gardens. The facilities of the National Assembly were slowly becoming outdated and in need of revitalization. Following the parliamentary reform of 2009, ambitious goals had been established, notably in order to allow more sittings of parliamentary commissions and to give citizens, who were visiting in increasing numbers, greater access to the National Assembly. As well, the security systems in place were no longer adapted to the latest technologies in use and it was becoming urgent to update them to reflect global security concerns. The addition of a reception pavilion thus became inevitable. However, it was just as necessary to preserve the Parliament Building, a historic monument designed by Eugene-Ìätienne Tache, and to showcase it. Its facade depicts the history of Quebec, and is one of the rare facades in the world to boast such an iconographic narrative. Our solution was to create an underground reception pavilion nestled beneath the existing staircase and to link it to an entrance with an elevator, located in the inner courtyard, to allow access to the upper floors. Surrounding the entrance, support spaces have been set up. In their entirety, the new structures account for an expansion of 5,100 m2, while completely preserving the heritage context and the interpretation of the Parliament Building.