The creation of a high tower consisting mainly of top-of-the range accommodation and in particular in the upper level which houses “ the most expensive apartment in the world”. The site is managed by Vinci which selected the Italian contractor Tosoni to create the façades. Threer Atex are involved, one of which has a bonded exterior glass curtain wall façade in screen-printed convex blue glass the breast of which has 1 hour fire-arresting properties at a height of 1,200m. Five successive laboratory tests will ultimately be necessary to validate this performance. One of the challenges of the project is to make contractors aware of the top-of-the-range quality of the project with the necessary level of finishing work.