Doppler (also known as Amazon Tower I and Rufus 2.0 Block 14) is a 524-foot-tall (160 m) office building in Seattle, Washington, United States, that is home to the corporate headquarters of Amazon. It is located in the Denny Triangle neighborhood of the city, at the intersection of Westlake Avenue and 7th Avenue near the Westlake Center and McGraw Square. Doppler is part of the three-tower campus that Amazon is developing in the area and is able to house 3,800 employees. The tower takes its name from the internal codename of the Amazon Echo voice-controlled speaker, which launched in 2014.
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