It used to be, people visiting the downtown building could access virtually every floor, at any time of the day.
Now, all visitors must have an appointment and be escorted to and from secure floors.
All staff must also wear a photo ID.
"We want to remain very user friendly to the community, however, we have to balance that with building security. We may be one of the most insecure police departments in the country, so we have to fix that," says Oakland Police spokeswoman Holly Joshi.
Last month, a man was shot by police outside headquarters after damaging half a dozen squad cars using a shotgun and a hatchet. And then on Friday, another man drove a rental truck into the police parking lot and ran off.
The incident prompted a bomb scare and evacuations.