Secret Bunkers, 11 across the country

I heard from an active Secret Service Agent that there are 11 bunkers in the US used to protect goverment officals as the travel the country in the event of an emergency. What spiked my intrest is that the agent said that there was a bunker under a building in Down Town Sarasota Florida. The building is a normal office building that has normal non goverment business, and the company that owns it is a secret goverment contractor. The story i was told is that on 09-11 the President was at a local elementry school close to Sarasota when the attacks took place. And it is alleged that the President stayed in this bunker till the attacks ceased. I have no way to verify this info other than the story the Agent told me.

Jason