| Milestones | ||
| March 22 | 2002 | Purchase of the area of the former East yard |
| May 6 | 2004 | Initiation of demolition |
| April 25 | 2005 | Preparation of land for building |
| April 27 | 2006 | Announcement of naming right partnership with O2 Germany |
| September 13 | 2006 | Laying of the foundation stone |
| May 8 | 2007 | InBev becomes founding partner |
| June 4 | 2007 | GASAG becomes founding partner |
| June | 2007 | Start of the steel construction |
| July | 2007 | Completion of shell construction |
| August 31 | 2007 | Coca Cola becomes founding partner |
| September 10 | 2007 | Eurohypo becomes founding partner |
| September 20 | 2007 | Topping-out ceremony |
| July 3 | 2008 | VISA becomes founding partner |
| July 17 | 2008 | First ice |
| September 10 | 2008 | O2 World Grand Opening |
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