In a location in the middle of Zurich that is exposed to a lot of noise, an existing house is to be demolished and replaced with a new building. The client wants to live on the first two floors. Small rental apartments will be built above. Due to the noise pollution, the living rooms cannot be ventilated towards the street. The staircase is therefore positioned towards the street. The volume is cut into the courtyard so that the room in the corner facing the courtyard can also be ventilated.