To me, it seems your fairly limited to "effect" by the lights on hand (1.2 HMI and Kinos/ one hard, depending on the lens you use, and many soft sources). I can understand wanting to favor the blues, as to my knowledge the red is bias in this regard, however I would bring those lights that you have on reserve into play.
Do you have considerations for the windows? The Tungsten package along with a little gel play could be used to throw a some light on background elements or the ceiling for mood, or to sell that you are several stories up (this would be mimicking street light, i would not use it for moon light personally). Too, this juxtaposed to the 5600 (white if camera is daylight balanced) could add some color separation between foreground and background elements.
Practicals can really help as well. Do you have an art department on the project? If so, I would talk to them about what they have on hand, if not take it into your own hands and...well get your hands on some lamps (from friends and the like).
As for the over heads, another thing to consider is that some office buildings have two settings for their overheads, one that uses all of the lights in the unit, and one that uses a single bulb, every two or three units per row of lights.
Can you get access to the space before hand and do a little prerig/ test? The best option for you may be to get in there and play with a few units.
As with any project, many ways to go.
Good Luck,
V