Personally I think offices of 2-3 people who are working together on the same thing is ideal. You want some level of communication for immediate stuff but a bar

Personally I think offices of 2-3 people who are working together on the same thing is ideal. You want some level of communication for immediate stuff but a barrier big enough for non-immediate stuff that others need to actually get up and go to you rather just pop their heads up. As well it allows conversations between interested parties while keeping it quiet for the other groups. I've found this to be the best setup for me personally.