After four years of construction, the extension to the Küppersmühle Museum in Duisburg, Germany, has been completed: the annex, designed by Herzog & de Meuron, takes its cue from the existing building – a historic grain mill converted into a museum in 1999 by the same Basel-based firm. 

The added area of 2,500 sqm accommodates some 300 works from the Ströher Collection, distributed over 36 exhibition rooms complemented by renovated historic silos. The annex has been designed with respect for the existing architecture – a 19th century industrial building: three structures of different heights, clad in red brick, form the new block, which ends in an urban green oasis.