3150 South 160th Street, Seattle, WA, 98188, U S A (Google Maps)
To get to the Avis rental car station, follow the signs toward baggage claim and exit through door 2 or 15 (which are at the north and south ends of the main terminal, respectively). Board the common airport shuttle bus and get off at the Rental Car Facility. Inside this facility, you will see the Avis sign and an employee will be able to help you rent a car.