We see the unit as being a private living space for one family. Due to the high density and a preferable direct connection to the ground floor, the unit becomes a vertical addition of space, adjustable to the needs of the inhabitants. The Units are arranged around a concrete core containing water storage and sanitary functions, together with the core, the concrete load bearing walls build a base structure and provide enough stability against flooding and permanently wet ground. In upper floors of the building the construction changes to a light flexible wooden frame system.