Schhlieren (ZH): Liechti Graf Zumsteg build new retirement center with 60 apartments A new retirement center designed by Liechti Graf Zumsteg is being built in Schlieren at a cost of 44 million Swiss francs. 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