We are trying to rebuild our office. 20 people (13 developers). What would be the top priorities for you? Best tips you could give us?

Ping pong table!

3 monitors / developer

1. Big dining area with a long table.. Nothing brings the team together like food..
2. Fully stocked bar.. nothing relaxes the team like a good wiskey.
3. Games.. consoles are the best thing ever.
4. sockets. .. electrical sockets.. a lot of them and put them high!!
5.Cameras... share your team members fuck ups and laugh about it.. helps my team))

coffee, good internet speed, pingpong and maybe some snack bar

Decent wifi
Big big screen/media bench/white walls with projector so you can pair program/do standup
Enough meeting rooms so those that do need to chat can do so without disturbing others
Fruit baskets
Standing desks
Big screen showing status of apps/builds (maybe combine with above?)

PMs as far away the developers as possible

lunch together, standing desks, good relax possibilities, no cubicles, headphones for all, shared speakers, good meetingroom with big tv screen and a few strobes with discolights and a smokemachine for the friday drinks.

Flexible hours and hire some cool remote devs like me.

Offices, cubicles or partitions... Open workspace sucks for productivity

Desks that can be moved easily so people working on the same feature can physically be in the same space. Like, I can turn my chair around and can ask the PM a question.

I know PMs are thought to be the bad guys, but if you're doing it right, they will make your product better in a shorter space of time. FWIW, most companies aren't doing it right -- including mine.

pinball machine

Do not disturb signs on each desk

laptops with docking stations, at least three monitors, and let all the devs work from home.

use all that extra space for meeting rooms and spare cubes for the devs that want to come in for the day to have a place to sit.

Oh! A place where people can make a private phone call. I saw one place where there repurposed telephone booths for individual phone calls and had a camera in there for conferencing into other offices. That saved a ton of space and kept people from tying up big rooms for things that was just for a single person.