It is a building of 26.736m2 between covered spaces, vehicular circulations and nuclei. The building is composed of 2 clearly differentiated building systems; One proposes a pre-cast concrete structure for parking mainly and the other develops a concrete structure in situ, which houses a staircase core, elevator core and offices with office on each floor. Since the building contains 2 well-differentiated functions such as the garages and a convention center, we sought to unify its volumetric image, placing these functions behind the precast concrete sills