R50 is an innovative cohousing project located in Berlin's Kreuzberg neighborhood. Completed in 2013, it was designed by architects ifau und Jesko Fezer and Heide & von Beckerath in collaboration with its future residents. The six-story building comprises 19 apartments, a studio, and various shared spaces, including a communal garden, workshop, laundry, and rooftop terrace.

The project exemplifies the Baugruppen model, where a group of individuals collectively fund and design their living space. R50's participatory planning process involved regular meetings between architects and residents, resulting in a design that balances individual needs with communal living ideals. The building features a distinctive wrap-around balcony that connects all units and serves as a shared outdoor space.

R50's design prioritizes flexibility and sustainability. Its reinforced concrete structure and modular timber facade allow for easy adaptation of living spaces. The project also exceeded energy efficiency standards, reducing consumption by 30% compared to regulations at the time.

The success of R50 lies in its affordability, community-focused design, and integration into the existing urban fabric. It represents a new model for urban living that emphasizes collective decision-making and sustainable practices, offering valuable insights for future housing developments in dense urban environments.