Christopher Alexander's work isn't based on empirical studies, though, is it? Never seen any. It's just his, uh, inspired opinion.
But seeing your comment made me start trying to dig up a 1987 paper from Alexander titled, "Toward a Personal Workplace," and I am actually amazed and unsettled by how hard it is to find anything online. That article surveys more empirical properties of office interiors. But yes, I would look to the studies cited in the Peopleware chapter called, "Bring Back the Door" for the empirical extensions of what Alexander had inspired.
Here's the best link I could find on that thread of Alexander's work: