We missed out on a chance to have a giant urban park ("Seattle Commons": http://www.historylink.org/index.cfm?DisplayPage=output.cfm&...), but credit to Paul Allen for executing an unbelievable plan B.
[Bloomberg's article focuses more on Amazon's new HQ in downtown Seattle, but Amazon's impact today is mostly in South Lake Union. Background: http://www.seattletimes.com/business/real-estate/amazon-will...]
(Source: Born in Seattle and have lived within ~0.5 miles for 10+ years)