Do you realise I actually had to stop and make floor plans for this building in order to make things work out right? I couldn’t figure how to include the stairways, and the scale is off, but the rest is all there. For the first floor, at least. The top of the stairs Fielding goes up from the reception hall in the basement would be at the upper right, between the back outside door and the door leading into the long, narrow storage room.
To be a successful investigator able to sneak into any building without getting caught you need flexibility, a thorough knowledge of your target, and a quick mind that stays calm under pressure — all traits Fielding lacks.
You know who had them in spades, though?