What began as a research question at the Brandenburg University of Technology Cottbus-Senftenberg (BTU) is now taking shape in Kolkwitz: At the Sportverein 1896 e.V. on Jahnstraße, the shell of a multi-purpose building stands, constructed almost entirely from dismantled concrete slabs from old GDR residential blocks. Today, a topping-out ceremony is being held to mark the occasion.