Thanks to reader Andrew Stern, we’ve got some photos that indicate Apple is already preparing San Francisco’s Yerba Buena Center for its September 12th iPhone 5 media event. While it appears that the exterior banners will be going up tomorrow (based on Cherry Pickers being prepped outside the front), Apple has already put up its logos inside of Yerba Buena.

Update: Andrew Stern has shot several more high-resolution photos showing banner installation and more:

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