Durability of buildings, the capacity to provide functional usable space for a certain time, as a concept of sustainable architecture forms the starting point and motivation for this project. As part of this main approach, the future function strategy should be introduced. This strategy contains an existing building which will be redesigned in a way that it can serve multiple functions during time and at the same time, with minimal interventions needed to accomplish a function change. The future function strategy is intent to be independent from a location to be widely usable. However, in the end the location will demand the desirable functions. At this project, the choice of the selected functions is determined by the particular case of the marine terrain, where various buildings will need a new function after the marine establishment has left in 2018. Specific for the marine terrain, residential and commercial space are the two functions which the building minimally should be able to accommodate. Designing a building applicable for multiple functions means that it should be able to meet the requirements of these different functions.