There was an article in the Camera about someone trying to acquire the old StorageTek land (Louisville) with the idea of presenting it to Amazon as an option. I don't no how serious or credible an option that is.
I am having a NIMBY moment:
I live in Lafayette and I personally hope that if they do move to Colorado that it is now where near me. That many employees alone would put an unbearable strain on the roads, public transit, water, sewage, parking and other infrastructure and that doesn't take into account the businesses that would grow up along side it, their employees, etc., etc., to say nothing of the likely years of construction.

Then there is the whole question of freebies and incentives that Amazon will probably want to relocate to Colorado. If anyone in the world has enough money it's Amazon - they don't require tax breaks and free infrastructure. 

I wonders why they would want two headquarters in the western half of the country anyhow? Drive up the bid from others?