Does anyone know of a complete map or overpasses database in downtown Seattle?

I do not think there are enough of them to justify a full map – perhaps only two or three of them? The closest I know of a map is the King Country Metro Accessible Seattle Card (http://metro.kingcounty.gov/tops/accessible/accessmap-1009.pdf) which focuses mainly on the wheelchair roads throughout the city center (eg, entering a building and use the elevator to avoid strong hillclimb), but also identifies some tunnels and airlift. Rainier Square tunnel you mentioned, and the Westlake station (which connects Buenos Macy'sThe / Westlake / Nordstrom and Pacific Place on the bridge) are the only ones I know.

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