Downtown Denver would not work and the infrastructure is just not there when it concerns traffic, available land and sufficient housing stock. Colorado and all the major cities in the state south of I70 should send a proposal that involves the city of Lone Tree. The area to be developed which will be creating Lone trees new downtown includes access to light rail and hundreds of acres of open land ready to be developed. Being south of Denver, would help with traffic and would push the state to add more lanes to I25 given all the workers that would come from Colorado Springs and the DTC suburbs. Its the only proposal that Colorado can send that has a fighting chance. Having AMAZON 2nd headquarters in Colorado would change Denver metro drastically! similar to what has happened in Seattle and the Seattle suburbs.