I've said this before, but it is worth taking the time to get the camera properly centered. A shot that is not completely horizontal can be corrected by cropping, but there is no way to completely correct a shot that is not properly centered, and being off by only an inch or two can make the difference.
I also took a few "level" shots of the atrium, including the following.
Finally, one of the main reasons I went back to the Loyalty Building was to try to capture the lines of the stairway leading to the lower level. At the Doors Open event there were always people milling around. Not the worst to have people in a shot, but not if they are moving all the time. This was probably the best of the stairway shots, which I converted to a black & white.
Not bad but a wider angled lens would have helped here.