Amazon drastically affecting property values?

[Andy W.]

  Amazon is supposed to be building a second location, estimates of 40,000 jobs, 5 billion or more invested into the areas surronding it. Chicago, Dallas, Denver, Detroit and a few more cities fighting for them to set up shop in thier town.

 If you owned a duplex, single family or multi family within 5 miles of this new location, how much do you think your property would increase after they announce the location? Maybe 150k to 200k? Or 400k to 700k? I'm guessing it would be massive. No correct answer to the question, just everyones opinions.