Safe storage building

Would you like to think about a interesting concept to create a higher density building? The building is a highly secure safe storage. For security reasons is the building and foundation over-engineered. This creates the possibility to use the strength of the foundation to create vertical densification by adding more stories. The owner would like to investigate the possibilities to also give the building functions for the neighborhood, sports and elderly for example. The project will be on a concept level but since it is a very complex building, it requires a lot of attention to detail already.