Is there a return of rental cars in Seattle, WA Amtrak station?

I take Amtrak Cascades in June 2008 in Seattle, WA to Portland, OR. I'll have a rental car to return and asked me to hire back are places near the station. Do I have to walk with them or rape, me led to the Amtrak station? What businesses are nearby? Thanks!

It is a service station where you can return the car. Good luck!

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