Yes: you can notice this, for example, in the announcements they put out while the area around the Getty Villa evacuated and then burned, where they pointed out that non-emergency staff had evacuated. Similarly, I think JPL always had (emergency) staff present, and their own firefighting resources.
Having heard about wildfire policies for some high-profile institutions in fire-prone areas, they'll often have their own procedures, in coordination with local authorities, which may not involve evacuating when others do, and may involve people coming to the site when others are evacuating.
I imagine they have a number of life-support systems to ensure the staff can hang out in the building for a while in case of a severe natural disaster.
Having heard about wildfire policies for some high-profile institutions in fire-prone areas, they'll often have their own procedures, in coordination with local authorities, which may not involve evacuating when others do, and may involve people coming to the site when others are evacuating.