In one of the buildings I work in, there are lawyers and accountants, web developers and marketers, and numerous other small businesses. Everyone's (shared) internet is routed through the same server room (which doubles as a broom closet), which is left unlocked and could be accessed by the public during working hours.
This seems to me to be a ridiculous security risk, but I don't know exactly how to quantify that to the building owner and/or the businesses at risk.
Exactly what sorts of risks are we facing and what danger are we in?