It will be far more interesting to see the impacts on Queens versus Crystal City, IMHO.

Crystal City already has a strong tech presence - it's government, not industry, but still - no shortage of technology around. 25K new workers is about a second Pentagon in the area, but nothing more than that. Office rental rate pressure will slightly go up, but Amazon's a drop in the bucket compared to federal government buying power for office space.

Queens, though, is a dramatic change to the general landscape of that area. I can't even imagine an Amazon-style campus in the middle of Jamaica.