This is one of the most innovative developments in Europe, with a mix of retail, residential, office, hotel, hospitality, cultural and entertainment uses on a total gross floor area of 410,000 m². The celebration was led by Unibail-Rodamco-Westfield CEO Christophe Cuvillier together with Hamburg's first mayor Dr. Peter Tschentscher and the HPP planning team headed by Senior Partner Werner Sübai. The ceremony marked the start of the construction works.