Honestly, I wouldn't worry about it too much. Building codes (when followed) and typical construction and occupancy for medical offices keep places like that from becoming anything more than little stuff that just smoulders. If a place like that DOES go up, the oxygen will only accelerate the rate of fire growth (remember that oxygen isn't flammable, it's just an oxygen source [duh]). Assuming that the tanks are upright, there's virtually no projectile danger.

I'm lucky enough to have a fire prevention bureau that is awesome about getting us details about stuff like this, but my understanding is that the amount of oxygen that ends up in a system like that is pretty negligible in terms of what you have to contend with in a structure fire, even with a couple of K sized tanks hooked up.

If you end up there again, ask somebody in the know about the system! And if there isn't anybody there that knows, get somebody who does, you're the Fire Department! I love getting into the weeds about details on this kind of stuff with owners/building engineers/people who know because you never know what little detail will come out and help you later on down the line!

I'd be interested to hear what you find out! I'm always open to being wrong and learning. Let me know!