For 70 years it was home to the BBC World Service. But the broadcasters have gone and Bush House in London has become part of the new Aldwych Quarter.
A £61m refurbishment has ripped out the characteristically BBC warren of studios and shabby offices and created a centre for modern business.
But that, as the architect in charge of refurbishment points out, was what Irving T Bush always intended.
You could spend hours with architect John Robertson striding around the enormous office space he's just refurbished in central London without exhausting his enthusiasm for the former headquarters of BBC World Service radio.
The studios are all gone but almost every stairwell or basement has some tiny detail of design to draw his attention - from an intricately wrought banister rail to an elegant piece of coving which for decades lurked hidden above a false ceiling.
Robertson was commissioned by the Japanese owners, Kato Kagaku, to return Bush House to a modernised version of how it was built in the 1920s by New York businessman Irving T Bush. More on this story..
