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The refurbishment will keep the current concrete and steel structure, add six floors and increase the floorplate.
The unit will have a capacity of two million tonnes, with start-up scheduled for 2029.
The US-based financial services firm secured the highest position by deal value in 2025, advising on transactions worth $43.3bn.
The plans include the construction of up to 1,600 new homes, retail outlets and public spaces.