This project takes place in Friedrichshain, Berlin, Germany and presents the design of a Public Condenser along the Straße der Pariser Kommune named ’Bau(m) Berlin’. The project is part of the Public Building Graduation Studio and looks into the topic of designing a ’new urban lounge and commons’ through the process of Research by Design. Through field research and urban analysis, three issues came to the forth in the Friedrichshain area; A disconnection between residents, a missing framework for social (re-)integration and low quality green space. These issues consequently led to choosing the project site along the Straße der Pariser Kommune and forming the following research question: ”What if there could be an architecture that pushes interaction so that the social gap between people could be bridged whilst functioning as a platform that helps people to (re-) enter society?” In order to tackle the pre-described issues, the project takes the notion of ’building’ and dissects it into ’Building the Future Commons’, ’Building Connections’ and ’Building Things’. Together they describe and result into the project Bau(m). The ’m’ in Bau(m) entails the notion and concept of Multiplicity, e.i. the idea that a thing, in this case a public building, can be used in multiple ways, for various programmatic functions, throughout time. For me, this meant seeing architecture as a framework that allows for adaptable use of a building. Consequently, the building is designed as a pavilion within the park stretching along the Straße der Pariser Kommune and has one big roof supported by a grid structure column repetition made from timber. The columns are bended so that together, they form an arch-shaped pattern. By seeing the building as part of the park, the park is equally redesigned into a park of higher quality with an urban route that stretches through the building and connects the Ostbahnhof train station with the Karl-Marx-Allee further North. The main function of the building is a workshop space for various crafts, amongst which furniture making, as it uses the method of making as a way of bringing people together and getting those in need back on into society. This workshop space stretches into the basement and thus forms the substructure of an urban square that exists in front of the building.