In my opinion, a good office should have (a) shower(s) -- unless it's right next to a gym, a spot to take naps, and a spot to take private calls. In addition of a layout fit for the way teams are organized.
I looked into building small rooms for offices with necessities like that. I even considered if you could use old containers and build it out of them, but there is problem with protecting against rain, wind and the lack of windows.
This seems like a good rule - but it would be easier to look for office space near gyms than build those out yourself, I would think. Or perhaps it's a business opportunity waiting to happen for some pop-up gyms to open amongst office towers...
That sounds awesome. Just from my own experience, having some intermittent activity throughout a day can help a lot. Walks can help for small breaks, and then you can maybe go for a jog during lunch, and maybe a jog/cycle for coming to and from work. Not to mention naps for people who get that noon slump.
I wouldn't be surprised at all if having such facilities, and allowing for naps, would have a measurably positive effect on the work environment. Assuming of course that the people who work there are willing to and wanting to use such facilities.
Some people might be very active and healthy in their free time, but I wonder if allowing for more healthy habits during those 8 hour stretches of often very sedentary work would even be a boost for those people.
My old dorm-room had this layout: http://i.imgur.com/FB3PGYT.jpg which would work great for a two person office.
I do like the idea with having showers available.