The Rental Car Center is a separate facility from the airport terminals. You can access the building by taking the Airport SkyTrain, otherwise the building is about a 30min walk from the terminal. Companies with a presence at the Rental Car Center include Advantage, Alamo, Budget, Avis, Enterprise, Dollar, National, Sixt, and Thrifty. This site is also the location for those picking up or dropping off pre-booked rental cars.