The cramped original floor plan has been opened up, creating long sightlines in the building. A patio in the roof construction has been created above the glass ceiling in the hall to provide the attic with natural light and outside space. This creates a light and spacious penthouse, in a residual space that was previously used as storage. A sustainability upgrade has also been made: the use of double glazing in the original steel frames and the application and special very high-quality thin insulation boards in such a way that the original detailing of moldings, tiling and paneling was not affected.