The best working environment I was ever part of in terms of productivity was set up with private offices, but at the team level. We'd have a team of people who

The best working environment I was ever part of in terms of productivity was set up with private offices, but at the team level. We'd have a team of people who were all working on the same component (five or six people) in a room with each other, but otherwise insulated from the bustle of the office. It was hugely helpful to be in a room with all of the people who were relevant to your work, and no other distractions. That may have just been due to having a good team, but I have a lot of good memories from that time.