Lansdowne Partners, one of the most established hedge funds in London, is set to move into one of the capital’s latest office revamps — a highlight in an otherwise slow start to the year for leasing deals in prestigious Mayfair.

The hedge fund’s agreement to pre-let the top four floors of 25 Berkeley Square was one of the larger West End office deals tracked by the research team at Savills in January. The property agency counted only 18 transactions over the month, the lowest level for January in more than a decade.