The project forms one component of a large new urban development in Wienerberg, Vienna. In place of simple stacking of identical layers, the design uses interlocking floors, which create spaces of differing heights. The result is an interlaces wickerwork of levels so complex that eight cross-sections are required to explain the structure. Despite a nominal room height of 2.5 metres, this configuration allows lofty living areas of 3.3 metres to the south, completed by lower zones of 2.3 metres to the north, for sleeping and recreation. The differentiated floor heights are of prime importance to the economic feasibility of the project. It is this innovative design, which results in an additional storey on the north side of the building.