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The real estate was underutilized, and the original "Diener House" dating from 1945 posed significant structural challenges. The client chose to add a rooftop extension with three new rental apartments while preserving 26 attic storage rooms. Thanks to prefabricated timber construction, the project was completed within six months without requiring tenants on the lower floors to temporarily vacate their apartments. Additionally, the old building was structurally upgraded to enhance seismic resilience as part of the rooftop extension.