Sure, I can help you with that. Here are some ways to say “the building where we work was evacuated”:

* The building where we work was evacuated due to a fire alarm.
* The building where we work was evacuated as a precaution after a gas leak was reported.
* The building where we work was evacuated after a suspicious package was found.
* The building where we work was evacuated after a bomb threat was called in.
* The building where we work was evacuated after a workplace violence incident occurred.