The biggest challenge was to bring natural lighting into the building. The logical consequence of shaping out an inner courtyard was twisted around: The presented idea was to cut triangular haped prisms on each side of the square building, in order to flood the interior with natural light and by this loosen up the massive monolithic geometry of the existing building. These created voids redefine the building's urban presence entirely, opening the volume up on all four sides. The voids, as well a strategic terracing and twisting of the floors, optimize views to central Berlin. All floors have access to outdoor communal spaces for working, entertaining and relaxing.