I encourage to read this article on how to design a office space for software teams (or any kind of engineer). There is scientific evidence showing the correlation between a good office space and productivity and his main points are:

1. Private offices with doors that close were absolutely required and not open to negotiation.
2. Programmers need lots of power outlets. They should be able to plug new gizmos in at desk height without crawling on the floor.
3. We need to be able to rewire any data lines (phone, LAN, cable TV, alarms, etc.) easily without opening any walls, ever.
4. It should be possible to do pair programming.
5. When you’re working with a monitor all day, you need to rest your eyes by looking at something far away, so monitors should not be up against walls.
6. The office should be a hang out: a pleasant place to spend time. If you’re meeting your friends for dinner after work you should want to meet at the office

a great read…