Seattle is the de facto city for Shadowrun games. Like, the Space Needle has been on the core book covers.
I'm not exactly sure why, as the company that made Shadowrun was based in Chicago, but it's probably just that Seattle was "exotic" enough and 'techy' enough to go "Yeah, let's do that."
And, I mean, nowadays, it's where Amazon and Microsoft are headquartered, and something like the 3rd most arts-invested city in America. Because no one remembers Eastern Washington exists, and no one cares about any part of Western Washington that isn't with 20 miles of the coast