How about they build their office space on their existing land? Looking at Google HQ on Google Maps satellite view, it looks like their land is 30-50% parking, i.e. waste.
"40% of the buildings in Manhattan could not be built today."
https://www.nytimes.com/interactive/2016/05/19/upshot/forty-...
Heavily oversimplified, back when cars first became available to the middle class city politicians had a rude awakening when street parking became congested.
Minimum parking space requirements were decided on with an overly simplistic formula focusing on providing for peak demand.
And it never really got better from there
Privately run buses help, but that's still not a transit solution.