Its capacity is something around 25k-ish, which is nowhere close to Apple's entire workforce. In fact, Apple owns tens (if not hundreds) of offices across Cupertino, Santa Clara and Sunnyvale; you can see a blue Apple logo everywhere.
IIRC, the logo you see outside buildings is a random color from a set of 5 or so. They match the Apple logo colors they use on the employee badges, which are also assigned randomly.
