An interesting paper was just published (June, 2010) in Journal of Experimental Psychology: Applied, 16(2), 158-172, by Craig Knight & S. Alexander Haslam of University of Exeter: "The Relative Merits of Lean, Enriched, and Empowered Offices: An Experimental Examination of the Impact of Workspace Management Strategies on Well-Being and Productivity."
Although the measure(s) of productivity used were rigorous (and therefore very low-level & controlled), given the nature of their independent variable(s), I would argue that higher-level measures of productivity would be more strongly influenced--and in the same direction--as were their productivity measures.
I love findings that disagree with generally accepted practice, and this paper's conclusions definitely do that . . .