In late 2020, private equity giant KKR will leave its offices just off London’s Pall Mall. Its new home, about a mile north near Oxford Street, is the largest Mayfair letting in more than a decade. But its most defining characteristic is that it will sit above an entrance to the Elizabeth line, still commonly referred to by its initial name of Crossrail — the new train route soon to stretch across the capital.

The line will run from Reading and Heathrow Airport in the west via central London to Shenfield and Abbey Wood in the east, and is expected to open in phases beginning in December. The optimism around its arrival is a shot in the arm for central London’s commercial property market, at a time when fears over Brexit weigh heavily on real estate.