It's very simple... Pleasanton is closer to Silicon Valley for commuters.
The prices on the Peninsula have remained strong so many people have chosen to make the commute from the East Bay and Pleasanton is the closest. You get a newer bigger home for a smaller price in Pleasanton compared to the Peninsula.
I am happy to send you data on inventory levels, days on the market, and pricing in different neighborhoods.
ALAIN PINEL REALTORS