The new building – which was commissioned by Rightacres Property on behalf of BBC Workplace – is adjacent to Cardiff Central train station and will accommodate some 1,200 staff.
The scheme was designed by architects Foster + Partners, while Legal & General provided funding.
Alan Bainbridge, director of property at the BBC, said: “To hand a building over of this scale and complexity exactly on time and budget is a real achievement.
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“We signed the agreement for lease back in December 2014 and the predicted handover date was today – it has been a fantastic effort by all parties and we now look forward to completing the fit-out ready for occupation next year.”
Rachel Dickie, head of urban regeneration at Legal & General Capital, added: “The transformation of Cardiff Central has been phenomenal and Legal & General’s continued funding commitment alongside the development expertise of our partner Rightacres has seen the project evolve at an extremely impressive rate.”