There's a hallway in the basement of my org's building near the chiller and boiler rooms and the print shop. It's off the beaten path for visitors and employees of the building, monitored (like the rest of the building) by security camera and it's straight out a door to a parking ramp or a loading dock - no having to bother w/ stairs or elevator to get to street level.

I just free-lock it. Even that might be overkill down there (one other commuter doesn't even free-lock her bike), but having had my last bike stolen from a locked garage at my home at the time, I tend to err on the side of caution when it comes to securing my bike. Better safe (and with bike) than sorry (and bikeless).