It has been taking shape in front of the eyes of people arriving at Cardiff Central Station over the last year.
And here's what the imposing new BBC Wales headquarters looks like inside.
The building - directly outside the main railway station - has been custom built for the broadcaster to replace its Llandaff headquarters.
It's part of the huge changes to the area now known as Central Square , formerly home to the dilapidated bus station.
It has been designed by architects Fosters + Partners and will be the base for BBC Wales Today, Newyddion, BBC Wales Live, Scrum V and daily programmes on BBC Radio Cymru and BBC Radio Wales.
In total, 1,000 production and support staff are relocating to the new building. That has now begun and the final teams arriving in the spring.
Mr Talfan Davies said the building has the most advanced broadcast facilities anywhere in the UK and is the corporation's "most open and accessible building".
Members of the public will be able to attend tours, community and learning activities.
BBC Cymru Wales Director Rhodri Talfan Davies said: " Central Square is all about opening up. Broadcasting and media are changing before our eyes.
"Our audiences these days expect to ‘get up close and personal’. We’ve designed this building to let the light in – not seal it off – and the fantastic location means that we’ll be more accessible.
"As part of the drive to ‘open up’, inclusion is a key part of the design of Central Square throughout. As well as opening up the ground floor to the public, the new building will be thoroughly accessible for people with a range of neurodivergent conditions."
