Foster & Partners’ City Hall building, which served as the headquarters for the mayor of London for almost 20 years, could soon get listed status, it has emerged.

The Department for Digital, Culture, Media and Sport has declined a request for a “certificate of immunity from listing” – or COI – made on behalf the building’s owners, which could have offered a window for radical redevelopment of the structure, or even demolition.

Current London Mayor Sadiq Khan relocated the Greater London Authority and London Assembly to Wilkinson Eyre’s The Crystal building earlier this year as part of a bid to save the capital £61m in rent over the next five years.

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