Birsfelden: Lease renewal for the UBS AST-KIS UBS AST-KIS was able to extend the rental agreements for two properties on Rührbergstrasse in Birsfelden (BL) by 20 years at an early stage. 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