Stock Photo - 05 October 2022, Berlin: Franziska Giffey (SPD,r), governing mayor of Berlin, and Ulrich Schiller, managing director of the housing company Howoge, stand on a roof in front of the pilot project for adding stories to prefabricated buildings in Berlin-Buch. Berlin's state-owned housing company Hogowe is investigating at two locations the extent to which the WBS 70 slab construction type is suitable for adding storeys to existing buildings. Photo: Fabian Sommer/dpa. - Berlin/Berlin/Germany

Stock Photo: 05 October 2022, Berlin: Franziska Giffey (SPD, r), governing mayor of Berlin, and Ulrich Schiller, managing director of the housing company Howoge.

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