Using the creation of an office space was a really effective way of getting ideas when considering what props I would need to flesh out the areas of the environment. Things like chairs, desks, monitors, light fixtures etc. The kind of stuff that will make the level look like an actual level, and not just some walls, floor and ceiling. The ease of reusing these assets will be a great time saving technique without skimping on the quality.
This office also changed the style I want to go for ever so slightly. With the corridor I had strayed a little from the clean sci-fi look, and the corridor looked more like a maintenance corridor than a clean, high tech office building.