The Max Planck Institute of Molecular Genetics in Berlin receives a functional building with the construction of Tower 3. The new Tower extends the existing laboratory buildings – Tower 1, 2 and 4 – with the urgently needed theoretical work spaces. The new building was built on an existing basement and closes the gap between the towers 2 and 4. Thus, the entire ensemble presents itself for the first time as a coherent structure with a centrally located main entrance. The Tower 3 is mainly organized with rooms on both sides of the corridor and encloses the inner foyer on four sides. As all four towers are linked functionally, the floor heights of the existing buildings have been included in the new building and all levels are joined together continuously. The ground floor contains three function rooms of varying sizes as well as a foyer that opens on all upper floors towards a skylight and acts as a central entrance hall. On the upper floors work spaces for theoretical research and computer science are located next to a server room.