The quick growth of cities in the last two decades all over the world led to a rapid increase in the number and height of high rise buildings even in unfavourable subground conditions. Since the 80's, a new foundation technique, the so-called piled rafts, has been developed and used extensively in order to reduce the maximum as well as the differential settlements and the associated tilting of the buildings. The analysis of piled raft is a very interesting example of the soil-structure interaction that requires the co-operation between the geotechnical and structural engineers to reach the most economic foundation system. Enhanced numerical analyses play a decisive role for the analyses of such complex foundation system. The piled raft foundation has shown its validity as a very economic geotechnical foundation type, where the structural loads are carried partly by the piles and partly by the raft contact stresses. This foundation system was successfully applied in stiff as well as soft subsoil.