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Since 2010 PETRA III, a third generation light source at DESY, has been running as a user facility, with all 14 undulator beam lines operational since autumn 2011. In order to fulfill the request for more beam time after the shut down of DORIS at the end of 2012, it was decided to add two additional halls at PETRA III, each housing 5 additional beam lines. Next to these two new halls about 100 m of the accelerator will be completely remodeled to install additional undulators. The upgrade should be accomplished during a 6 month shut down in 2013. In order to minimize this down time, it was decided to keep the existing accelerator tunnel in place. This has impact both on the mechanical connection between the accelerator and the experimental floor and on the design of the optical beam lines in the tunnel. In this paper the layout of the upgraded accelerator will be shown. The design status of the major components for the upgrade will be presented.
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