Built in the 1930s, used as an air raid shelter during the Second World War and severely damaged in 1944, St. Martin's Evangelical Church in Stuttgart's Nordbahnhof district was rebuilt in 1950. The church building, which consisted of a nave and a side aisle, an extension and a tower building with a full basement, was up for grabs due to the shrinking congregation and a lack of ideas for the location. The multi-purpose space was redeveloped in a multi-year participatory process. The resulting conversion and renovation measures include a fundamental, careful and at the same time architecturally high-quality interior conversion and the modernization of the building services of the listed church. An open-use church space in the nave, adaptive community rooms in the side wing as well as a bistro and exhibition space in the bunker, which opens up to the neighborhood via a square, were created for a new community life.

Selective conversions ensure the adaptability of the space. These include a newly designed gallery with two chapels and an extension of the altar area in the nave. The existing gallery structure, a ribbed structure that did not comply with the technical regulations in force at the time of construction, had to be replaced by a highly sophisticated steel structure that was indirectly supported by wall-like lattice girders in order to minimize interference with the existing supporting structure of the basement. The interior redesign also required the removal of load-bearing walls and the installation of supports in the form of steel girders. With the implemented conversion, the church is regarded as a flagship project of the Evangelical State Church in Baden-Württemberg.