Paul de Ruiter's office building for Rijkswaterstaat, the national water authority, nestles in the bend of the canal. The oblong building 142 metres long has an almost entirely see-through ground floor, level with the dyke, and an open parking facility below. The office storeys with their module of 12 metres have a wide range of possible subdivisions. Horizontal lengths of solar shading line the south face. With heat and cold storage at a depth of 65 metres and concrete core activation with fully integrated pipes, the building is extremely energy-efficient with the added bonus of a generous floor-to-floor height.