About -25%. Current campus size is roughly what it was in early 2014.
The difference in the housing market is that instead of being 28-year-olds who live in apartments, all those MTV Googlers are 38-year-olds with families who are sitting on a couple million in stock compensation each.
All of the broken up companies created, the Googlettes if you will, would be flush with senior devs and researchers, many of them somewhat well to do and likely with savings.
Many of those people will spread like the wind, create new startups, and will require a house with garage to house said startup.
The MVRA and agents will be happy indeed.
And we may get a new barbershop band out of it too.