Bloomberg's Norman Foster-designed European headquarters in London "sends a clear message to the world" that the UK capital remains a centre for global investment, said Sadiq Khan.
Speaking at the official unveiling of building, the mayor of London thanked American business magnate and former New York mayor Michael Bloomberg for what he called a "vote of confidence in London".
"It shows that despite Brexit, London is open. Open to business, open to investment, and open to some of the best design in the world," said Khan.

Office buildings for major corporations have become particularly political since the UK voted to leave the European Union, leaving a question mark over London's status a global financial hub. Frankfurt, in Germany, has seen a spike in high-rise towers being commissioned since the vote. With big banks potentially looking to base their operations elsewhere, other European cities are vying to position themselves as attractive alternatives.

"Whatever London and the UK's relationship to the EU proves to be, London's language, timezone, talent, infrastructure and culture all position it to grow as a global capital in years to come," said Bloomberg's founder.
Bloomberg rejected the concept of a shiny tower in favour of building "the world's most sustainable office", a 10-story block with a frame hewn from Derbyshire sandstone and accented with hand-patinated Japanese bronze fins that reference the architectural...