Here are some of the places that I’ve successfully looked online to find office space in Berlin.
- http://coworking.pbwiki.com
- http://hallenprojekt.de
- http://berlin.de.craigslist.org
- http://www.dasauge.de/ateliers/
- http://kleinanzeigen.zitty.de
- http://service.tip-berlin.de
- http://gsw.de
I hope this helps and if you know of others please leave them in the comments.
Check out Orco GSG the biggest owner and renter of office space in Berlin, can deliver very fast if necessary. Nice stuff can be found at Nicolas Berggruen Holdings ()and as well. Always glad to help you with Berlin real estate relevant questions.