The 3-person office would be just about enough for one person. Get rid of the interior-facing windows. Make sure the walls and doors are sound-proof. Combine the three desks into one large surface that's big enough to actually work at. Get a beefy workstation, and a quad 27" monitor array. Make sure the lights for the office are on their own circuit, so they can't be turned on by anyone else on the floor. Bookcases.