pretty sure both the hayward and the san andreas faults are not capable of this sort of destruction.
sounds more like a dark nihilistic adolescent fantasy.
There are a number of other scenarios that could conceivably take out all Bay Area offices: nuclear strikes on SF + Moffett Field, wildfires in the Diablo Range that sever all communications, secession of California and following military blockade, large scale protests or civil unrest that do the same, etc. Might as well protect against all of them rather than special-casing earthquakes.