24/07/2026
Exchange House at Broadgate
How do you build a 10-story office block over 18 active railway tracks without touching them? You turn the building into a bridge. šš¢
Wondering around Liverpool Street Station as a tourist, I was completely lost looking at Exchange House at Broadgate. It looked less like an office building and more like a massive steel creature that had forgotten where it was going.
As a structural engineer, my confusion turned into pure admiration:
š The building only touches the ground on 5% of its footprint (resting on just 4 pairs of concrete legs).
š It suspends 10 floors of office space from 4 giant parabolic steel arches.
š The elevator shafts, fire stairs, and main lobby are literally hanging in mid-air.
š It was built in 1990 without stopping a single train below it!
Itās one of those rare moments where a radical engineering solution becomes iconic architecture.
Shoutout to the genius team at SOM, Bovis, and everyone involved in pulled off this bit of "British engineering madness."
Structural Engineers Srinivasa 'Hal' Iyengar, ⢠William F. Baker (later engineer of the Burj Khalifa), and Robert C. Sinn
Whatās your favourite piece of structural engineering in London? Let me know below! š
(Photos & structural details linked in the first comment!)
Finally, I should apologise for reproducing several structural drawings and photographs that are not my own work. I felt they deserved to be shared, and I do so only out of genuine admiration for the remarkable people whose imaginationāand courageāmade this extraordinary building possible.