Settled comfortably around a black conference table – the only item of furniture in an office space still lacking its carpet tiles – on the 40th floor of the new Leadenhall Building, I had the opportunity to discuss with lead designer Graham Stirk and his partner, practice co-founder Richard Rogers, the forces that shaped their new building and how they came to be working in the City of London once again.

Rogers Stirk Harbour + Partners has a rich presence in the Square Mile, including the landmark Lloyd’s of London, standing directly opposite the Leadenhall Building. The firm has specialised in assured, sometimes assertive insertions within the City’s fine, historic urban grain, and so setting aside the sheer bravura of the 52-story, 225 meter skyscraper, with its sloping glass façade to the south (giving it the popular nickname of the Cheesegrater) the first question that arose was a simple one – how did the building come about?