French banking giant Société Générale is about to double the size of its St James’s Square office.
The bank, which is headquartered in Paris but operates major offices across London, is also moving ahead with plans to move into a new larger Canary Wharf office in 2019.
The St James's office houses SocGen's private-banking arm and currently covers 8,000 square feet.
If it goes through its thought the space will become home to SocGen's new additions from Kleinwort Benson, which it snapped up earlier this month.
The Paris bank is going against the grain by working to increase its London footprint when other UK and international banks are warning they could quit the country if a vote for a UK exit from the European Union goes through next week.
US banking giants Morgan Stanley and Citi have both warned their London operations could shrink if the UK votes to leave, while HSBC – the UK's largest bank by assets – has said it would again look into relocating its headquarters if the UK quits the EU.
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SocGen declined to comment.