Same thing happened to me at my new job. I had a little run-in with security my first week as I was walking my bike through the lobby. "No bikes in the lobby", yells the security guy from across the building. Then he asked if my employer knew I was riding my bike and if I had permission to do so. I was like wtf is the big deal, this is america and last time I checked bike weren't outlawed. But they are the power in these cases, it's private property and then create any rule they see fit.

I just take the stairs now, our receptionist about fell over when I told her I walk my bike up 5 flights of stairs as opposed to taking the freight elevator. I didn't even mention my 40 mile commute