- A student? Somebody failing in life and blames it on the teachers? Lots of people can escape, though the prof he goes after may not.
- Politically motivated? There are law offices on the top floors that work with Republicans, and most of the unhinged attackers have been leftists, so that's not impossible. They're hard to get at, though, and the easiest ways to attack are indiscriminate--firebombs, fire alarm and shoot people coming out of the stairways--that sort of thing.
- Attack on police office? There's a new Federal office above us. I've no idea what their security is like, but I'd guess the easy ways mentioned above would be the methods of choice.
- Terrorists looking for big name targets? Yeah, we qualify--sort of. Known around the world, soft target--two guys could kill a few dozen people quickly and encourage a reputation for their group's ruthlessness. Recon wouldn't be too hard, though strangers would stand out. We have a little sign forbidding guns and knives, of course. We're not on 5'th, and we figured a couple of ways to escape.
But all in all, an attack doesn't seem very likely. Terrorists will attack somebody, but I can think of a half a dozen more dramatic targets without scratching my head.
I wonder if the kind of student protests we're seen this past week are cathartic for the unhinged, or inspire them to attack? Attacks are rare enough that I don't think we'll get good statistics on the question. Fortunately.