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The Swissmill Tower, also known as Kornhaus, is the tallest operating grain elevator in the world. Standing at , it is the second-tallest building in the Swiss city of Zürich.
The site required piles built to a depth of in the bedrock of the Limmat Valley. The increase of its height to was done by slipforming. This required as many as 60 construction workers processing concrete in three shifts around the clock. The construction took place in two stages. The first phase was completed in early July 2015. The second began in September 2015, and end in April 2016. Mill operations continued during construction. The works were carried out by Implenia.
The Swissmill Tower can store 40,000 tonnes of grain. "La « La tour-silo » de Zurich" (page visited on 22 March 2020). Swissmill is the largest mill company in Switzerland, processing 800 tons of grain daily. This represents 30% of the Swiss national grain requirements. It supplies flour for Swiss retailers Coop, Volg and Landi.
Critics have said the silo's exterior and height are overly industrial. However, municipal authorities say that the silo was intentionally designed in that way. Its external appearance is intended to express its interior – an industrial plant.
In July 2016, there was a proposal to cover the tower's exterior with plants, in response to a request by Zürich politicians to redo the facade. Architect Miriam Vázquez suggested this during the planning phase, but later deemed it too expensive.
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