Things I wish I didn't have to say about offices
When every cop in the county goes blazing past you up the peninsula, and then the scanner goes insane, followed by Twitter, HN, reddit, and basically everything else, you know it's a bad sign.
If you work in an office building, you NEED TO KNOW where your exits are, and you need to know alternates. If you go visit another building during the day, make sure you possess the same knowledge for that new location while you're there.
Also, track down rooms with doors that can be locked. Hint: unisex bathrooms are almost always like this. Grab your phone, get your actual location, call the cops, let them know where you are, and stay safe. They will come to get you when they clear the building.