The First Interstate Bank building, later rename 707 Wilshire, and now called the Aon Center, is often brought up as an example building that burned a lot and did not collapse.
There's a number of objections to this comparison - the building had unusually good fireproofing, the progress was eventually stopped by sprinklers, and it actually came very close to collapsing. But I want to figure out if it's even structurally comparable.
I've only been able to find this as a floor plan:
From which, it seem, someone made a small schematic.
Which I used as a scale comparison with WTC7 and One Meridian Plaza
It's a bit odd though, as it seems to show only three core columns off to one side, and rather oddly spaced columns at the short ends.
Here's it's described as a "braced core"
So what was the structural part of the central core? Was it just Reinforced Concrete walls? Were there more columns? Are the above diagrams accurate?
Structural steel frame with lightweight concrete slab on profiled steel deck.
Construction photos would be ideal, but this is all I can find: