I'll add: Soundproofing. The best, reasonable cost version I encountered (in someone else's executive office) was expanding foam sprayed between the drywall s

I'll add: Soundproofing. The best, reasonable cost version I encountered (in someone else's executive office) was expanding foam sprayed between the drywall surfaces. In this case, installed during construction -- I can't imagine it was that expensive to add. A window admitting natural light. I add this because I've had the experience of working in private rooms, but next to very loud/noisy people. Still miserable -- sometimes open space is better because the noise blends (a very limited form of better).