The National Gallery has released refined proposals for Selldorf Architects’ £30m upgrade of its Trafalgar Square buildings, designed to mark the institution’s 200^th anniversary in 2024.

New York practice Selldorf beat a shortlist including David Chipperfield Architects, Caruso St John, Witherford Watson Mann, Asif Khan, Donald Insall, Publica and David Kohn Architects to land the NG200 project in July last year. In February it went public with its initial designs.

Now the National Gallery has put out further images of more detailed proposals for reconfiguring the grade I-listed buildings, worked up following an initial round of public consultation earlier this year.

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