In the flashback where ZXC fights with Shen Xi while bb!ZYL watches from the doorway (*sob*), I think ZXC's office is what is the exercise area in the modern-day SID. But presumably that was early on, and maybe ZXC moved into the proper chief's office later. Or maybe, yeah, ZYL rearranged the layout (and put his bikes on a gratuitous display platform)...
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