I don't think it's "corporate culture" as much as "large org power games" as I've seen the very same thing happen in academia and administration at large schools.
More to the point, though: what do they mean by corporate culture, and why do they believe that people need to be in the same room in order to maintain it?
I'll bet anything there is no real definition of "corporate culture". If there is, it has nothing to do with where the employees are at any given moment. Yes, I'm saying that "corporate culture" is just a meaningless buzzword thrown around by people who hope you don't stop to wonder what it is they actually mean.