Google owns almost the entire North Bayshore area - that's the area north of 101. They also own smaller campuses or isolated buildings by Whisman/Middlefield, Shoreline/Terra Bella, and Mayfield/Central.
But Mountain View still has large commercial/industrial zones by San Antonio Center, on Castro Street itself, and in the 237/85 triangle by Whisman/Ellis/Dana. The Whisman/Ellis area is particularly large: this is the home of Symantic, Veritas, YCombinator, Whatsapp, Coursera, Mozilla, Samsung, and several other companies that aren't household names.
If I don't cross 101, I really don't notice Google except for the commute traffic, Waymo cars and the shuttle busses during the commute. Kind of surprising that Google makes up 50% of Mountain View business real estate.
