2LB House is a private residence designed by Raphaël Nussbaumer Architectes and completed in 2014. Located in Geneva, Switzerland, the landscape with the impressive cliffy Salève mountain inspired the design of a solid, autonomous and mineral volume. The project’s organization is based on a matrix of 3 x 3 units with a hall and staircase in the center. All enclosing walls are in exposed concrete and were build in one single manufacturing process in order to procure a monolithic aspect without any horizontal division. The singular features of this house consist of three distinct space structures: the ‘glasshouse’ for the most public areas which access the garden on the ground floor; the ‘cave’ for all service areas – excavated into the slope. And the ‘lived-in roof’ with its attic-type roof-lights for bedrooms, bathrooms, dressing room, family room and studio. These elements synergy into a simply solution.