[grogenaut]

Actually Amazon's offices in SF are split between the valley and downtown, depending on what they're working on. I think hardware and embedded is out in the valley. Software / services are more in SF. And that's not counting Twitch which is in the Financial.

[nostrademons]

A9 (Amazon's search & advertising subsidiary) is in Palo Alto. That's the office I'm most familiar with, although perhaps that's because of the revolving door of high-level employees between it and Google.