All facades were designed with a consistent architectural approach, despite the building’s varied orientations. The design concept is a contemporary reinterpretation of a Haussmann-style building, using thin stone cladding and semi-load-bearing stone elements with varying facade thicknesses, structured through different grid compositions.

The energy performance of the building envelope, along with challenges related to working on an existing structure, such as load transfer and compatibility with the existing reinforced concrete frame were also major technical considerations in the project.