Willisau: New quarter in planning In Willisau (LU), the 30,000 sqm Wellisareal is to be built over. The design for this comes from the renowned Basel architectural firm Herzog & de Meuron. You need to be logged in to view this content. Please Log In. Not a Member? Join Us Annual subscription "IB+ Database" CHF 95.00 incl. VAT Add to cart