With a height of 165 m, the Maastower is the tallest building in The Netherlands. The roof level is at NAP +157,65 m. Stability is provided by a facade tube, which is formed by the bearing prefab facade elements. This facade tube collaborates with the in situ core, which houses 4 elevators for lowrise (up to the 30th floor) and 3 elevators for the highrise (30 up to 44th floor). The high foundation pressure compresses the compressible soil layers between NAP -35 m and NAP -50 m, which causes a dish-like setting of approx. 140 mm underneath the building. The interaction between the structure of the building and deformation of the sub soil has been analysed and predicted meticulously.