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The project maintains the existing steel structure of 1969, and increases the original volume by offsetting the main facades and adding several new levels. The existing 16-story social housing tower will rise to 21-storeys with a new height of 64 m. In order to retain the existing structure and foundations, the new floors incorporate a truss structure which creates a bridge over the existing tower transferring the additional loads to vertical elements in the new facade. In order to minimise intervention on the existing structure and with a limited existing ceiling height, the existing steel deck floor have been replaced by CLT panels, a light and compact solution.