Groupwork completes "world-first" high-rise held up by stone exoskeleton

A thousand tonnes of volcanic rock replace concrete and steel in Petra Heights, a housing development in north London by architecture studio Groupwork and engineer Webb Yates. The apartment building at 317 Finchley Road consists of three blocks ranging from six to 10 storeys, all held up by an exoskeleton of unreinforced stone. This ladder

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