In rec.woodworking, DerbyDad03 wrote:
On Wednesday, May 3, 2017 at 4:44:45 PM UTC-4, Steve wrote:
"The foundation, core, and ground floor are concrete, but the rest of
the seven-story structure is timber, making it the largest timber
building in North America.
I know what a foundation and a ground floor is, but what do you think
they mean by "core"?

https://en.wikipedia.org/wiki/Core_(architecture)

The "core" will have the staircases, elevators, and other services
(wiring and plumbing) for each floor. Another way to think of it is the
core is the common part of a building not rented to tennants.

Elijah
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betting fire code required concrete stairwells