Silicon Beat: Google is expanding in its hometown of Mountain View — and for the first time is strongly considering planting its flag in north San Jose in a big way, an indication that job growth in Santa Clara County remains robust. Google is said to be in talks to lease two expansion sites in Mountain View that together total 357,000 square feet, and also wants to grab about 150,000 square feet or more in north San Jose. “Silicon Valley is a hot area, and this is where talented people want to live.”