Ok, I'll give props to Seattle's main in-town innovation district, South Lake Union and the Denny Triangle, which are basically the 400 acres between Downtown proper and Lake Union.
Amazon's HQ probably counts as innovation, even though it's almost a mature company. They're currently building about 3,000,000 sf, and they plan millions more. Here's a Seattle Times story from this week that details what should soon be about 9,000,000 sf:
http://seattletimes.com/html/busines...21planxml.html
Additionally, office buildings of 11, 12, and 12 stories are under construction. One at 21 stories is in demo. Residential projects underway total 2,600 units including lowrises and towers of 40, 40, 39, and 20 stories. Laboratory projects include an eight-story multitenant building and a six-story full-block project for the Allen Brain Institute. Remarkably only one hotel is underway in that area.
Other major occupants in the area (ones with at least a couple buildings) include an annex of the University of Washington (5 buildings), the Fred Hutchinson Cancer Research Center (8 buildings or so), and the Seattle Children's Research (a few). If you cross Aurora (my numbers exclude this) you can add the Gates Foundation.
The volume of proposed buildings is similar what's underway now. The biggest growth area might be 40 story residentials, of which about a dozen are proposed in spots that limit them to 400' plus 40' for mechanical/architecture/amenities.