there are at least 2 mysteries in all this...
1. Google has purchased (and is continuing to purchase) IMMENSE (and very expensive) industrial and commercial properties...on a huge scale....
it is unknown just what ANY company, even a growing firm, could possibly do with nearly as much Real estate as this!
and
2. IF Google plans to house more computer programming type workers anywhere, putting them in the most expensive part of USA will cost the company a lot of extra money ... when they could have much better lives on lower wages... in hundreds of other, mostly-nicer places to live
NOTE that many tech workers in SillyCon Valley are desperately trying to find jobs ELSEWHERE, and many other large firms located there are adding new facilities in other states for these folks... and to be able to attract more workers when they expand their businesses
so, there’s a double-mystery to all this Google buying up of the California Bay Area... again, we are talking about huge acquisitions, some public some far less visible...in the multi-billions of dollars
The First Street / 237 / 101 triangle where Google is expanding is hugely congested as is the Google campus north of 101 in Mountain View. Traffic is horrendous and obviously going to continue getting much worse.
It seems to be poor planning since the infrastructure is overwhelmed already.