In the first part of this Architectural master thesis the Circular Economy is studied and results are Applied to the Amstel III district in Amsterdam, The Netherlands. In this study the Circular Strategies of Europe, the Netherlands and Amsterdam are distilled into 5 main drivers. The main driver this thesis focusses on is “Design for Disassembly” by creating new modular components with reversible connections. A new design system that allows change in program, volume and façade elements is designed. The second part of the thesis is the adaptation of this new design system into an architectural composition that fits the current needs of the neighborhood and allows for adaptation to a future scenario in which the urban composition of the area has changed. This architectural design shows the potential for the re-use of materials by transforming from an office building to a mixed use, mid-rise building that houses residential units and a modern interpretation of a library including a restaurant, an exhibition space and flexible workspaces. The adaptation of this new system leads to a significant decrease in building waste, CO2 emissions and Energy consumption.