What are the detailed driving directions for returning a rental car at the SeaTac Rental Car Facility from major highways (I-5, SR 518, SR 509, and I-405)?

The SeaTac Rental Car Facility, located at 1800 S 170th St, SeaTac, WA 98188, is accessible from four major highways with distinct entry points. From I-5 (northbound or southbound), take exit 154B for S 170th St; this is a right-hand exit that leads directly to the facility entrance after approximately 0. From SR 518 (eastbound), take exit 1A for S 170th St/International Blvd; this is a left-hand exit that requires merging left immediately after the exit ramp, then turning left at the traffic light onto S 170th St, with the facility entrance 0. 2 miles ahead on the right. From SR 509 (northbound), take exit 1 for S 170th St; this is a right-hand exit that leads to a roundabout; take the first exit from the roundabout onto S 170th St eastbound, and the facility entrance is 0. 4 miles on the left. From I-405 (southbound), take exit 1 for SR 518 West toward SeaTac Airport; this is a right-hand exit that merges onto SR 518 West; after 2. 5 miles, take exit 1A for S 170th St (left-hand exit), then follow the same instructions as from SR 518. All routes converge at the facility's single entry point, which is clearly marked with a 'Rental Car Return' sign. The facility operates 24/7, and the average drive time from any highway exit to the entry gate is under 5 minutes during non-peak hours. Note that the facility charges a daily parking fee of $4. 50 for rental car returns if the vehicle is not dropped off within the first 30 minutes of the rental agreement grace period.