The ground floor window on the left isn't really the office window is it? The office seemed to be partitioned off inside that area.
Yes there is a partition which abuts the window, so that the left hand pane is in the office and the middle and right hand panes are in the lobby.
It doesn't look that way from this picture.

It is though.

The window is made up of three lights, two you can see in that picture the other is on the other side of the partition.
EDIT: When I said left hand pane, I meant when looking at it from the outside, so the right hand pane in the pic you posted from the inside.