This is very good! Not super flashy; headings are clearly defined, I can understand what's what. The text is clear for the most part contrast wise-- I really like this semi-plain text look, it works well (at least for my eyes as a visually impaired person).
This has a lot of good detail! I do think maybe you should bring the 'what's really happening?' section up-- GMs will likely want to know that rather quickly so they can build toward it well.
I think maybe also you should reconsider the order of your locations. It's a bit confusing to go from the employee entrance to the roof, etc.
A map of some sort would also be super cool, maybe ASCII??
The fact this mission includes a number of things to do is great; it breathes, feels alive. Tbe hacking stuff at the bottom is really fun, I haven't seen anything else like that out of the submissions I've rated. This feels very classic cyberpunk, but I can see it being able to be used in other sci fi genres too with a bit of adjustment.
I think my only thoughts here on what to improve is that you might want to consider adding a bit more detail to the setting-- like more history, etc. Just to make it feel a little more like people really work here-- you're already on the right track. (:
Suggestions:
- move the what's really happening section closer to the top for the GM
- reconsider the list order of your locations
- make a small map? maps plural?
- add just a little more backstory etc to the building, elevate the sense that people work here!