Several of the planned hospital towers will rise to the height of Amazon.com's headquarters (look east of the I-5/I-90 junction for Amazon's building).
The space added will be roughly equivalent to the total space in the Columbia Tower-- 1.5 million square feet.
The graphic below was kindly contributed by a concerned neighbor. Click on the graphic to see it full-size. For additional landmark heights, see this site. 
Sunday, September 16, 2007
Heights of City Landmarks & the Hospital's Towers-To-Be
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9/16/2007