An ensemble of three buildings arranged around a green central courtyard is being developed on the northern bank of Baaken Harbour in the Elbbrücken Quarter of HafenCity Hamburg. Based on the cradle-to-cradle principle, the building is being assembled with recyclable and non-toxic materials that can be dismantled separately and reused at the end of the life cycle. All in all, the area created by horizontal and vertical greenery is larger than the building’s footprint. The green facade cools and conditions the air, produces oxygen and contributes towards the biodiversity in the city, characterises the residents’ urban realm and enhances the building’s design. In addition to being used as retention space and generate renewable energy, the horizontal areas are intended as exterior zones for private and communal use, for recreational purposes, urban farming, working and communication. The purely tenant-occupied property with variable floor plans and one third subsidized units is designed to accommodate people from different social backgrounds. The building incorporates co-living and co-working space, communal areas, such as kitchens, a library, a cinema, multi-purpose rooms, which can be booked via an app, a children’s day-care centre and a variety of exterior space on terraces, balconies and in the courtyard.