This project involved renovating a 27-storey office block built in the 1970s. The mixed concrete and metal structure was stripped and the asbestos removed one floor at a time, without the occupants having to relocate. Parquet floors and false ceilings were reconstructed in line with new technologies and all the heating, ventilation and lighting systems renewed. At the same time as the renovation, a plan to raise the building height was also drawn up. This was possible due to the overdimensioning of the structure.