It's the sheer number of administrators. Stanford has only 1,761 instructional employees, of which 834 are tenured faculty. The Redwood City facility will have 2,700 administrative employees in the first phase alone.
Maybe I'm not surprised by this because I work in higher ed, but that ratio of administrative staff vs faculty is not really anything to write home about. I work at a top 10 business school, and our staff/teaching ratio is about 5/1, and at schools like HBS or INSEAD in France, the ratio skews quite a bit higher.