The new coffee bar in the court of the Sforza Castle in Milan fits in well with the architecture surrounding without competing with the historical pre-existence, but becomes a favorite point for its contemplation.The project begins after winning the municipal competition.The announcement presented clear and binding guidelines: use of noble materials, greatest possible transparency, absence of stable foundations and short realization time.The combined planning of ARCò and Ariano offices conceived a modular steel and glass building, so that the standardization could facilitate the prefabrication in the workshop, and consequently minimize the building operation to the assemblage of the different elements.Thanks to this approach, we realized the building in only four weeks.