I think what I'm missing is contrast. Everything seems evenly lit. Add to that the gray sky which should actually be blue. And the missing sun. There is sunlight coming into the building. But there is no sun in the sky. When you are in a building with sunlight shining through a window the rest of the building appears much darker. The ceiling lights would interrupt that darkness. But they could use more contrast, too. Not sure if I'm explaining it right. I know many older maps that have been converted suffer from this because back then there was no way to take advantage of advanced lighting techniques. I'm not a map maker (sadly) so I can only speak from a user perspective.

Thanks for NakedAgent 's feedback. Monitors will be fixed tomorrow. I don't know how to make the lighting more dynamic...Maybe cast more dynamic shadows?

Wow, I love that building. Can you make the lighting a little more dynamic? Also, most monitors are turned away from the user by 90 degrees. Well, and we need enemies :)