My ideal office would have my own personal bathroom. I seem to get a lot done sitting on the toilet - new ideas, debugging breakthroughs, personal revelations, etc.
Our office suite only has two bathrooms and so I can't just stay in there until I'm good and ready to come out, new ideas in hand.
At home I have magazines and books in each bathroom. Big thick reference manuals make for good bathroom reading because you can learn something each visit. Consider the GNU Emacs manual for example.
I dream of a large personal office bathroom with a laptop or maybe a desktop on a cart, a stack of O'Reilly books, and perhaps a pad of paper and a few pencils. Good strong light would be needed for all the reading and some sort of book case or cabinet.
I'd instruct the nightly cleaning crew to leave the books, papers and computers as is.
Now that I think of it, a shower would be good too. That way I could bike to work without having to be so careful about getting all sweaty.