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I don’t necessarily agree that your workers should have spacious offices with doors that close, but they should still be comfortable enough. At one of my workplace, I constantly had to move to let other people out of their seats, and this was unbearable. So don’t do that.
In one job that I fondly remember, every employee had their own spacious cube, with a desk to put a computer and a place to put a few chairs. This was much more like it.