JP Morgan has appointed DTZ to oversee its search for a new London headquarters.
The investment bank is searching for an office complex of around 1m sq ft (929,022 sq m).
John Forrester, head of London agency at DTZ, will now work on the strategy behind its move.
The bank has already drawn up a list of options for the move, with options limited owing to the scale of the office size as well as the requirement for trading floors of at least 50,000 sq ft (4,645 sq m).