How do I return a rental car after hours at the SeaTac Rental Car Facility, and where are the key dropboxes located?

For after-hours returns at the SeaTac Rental Car Facility (located at 3140 S 160th St, SeaTac, WA 98188), follow these precise steps. First, drive to the facility's main entrance; the parking garage is open 24/7. Proceed to Level 4, which is clearly marked as the "After-Hours Return" level. Park your vehicle in any available space within this designated zone. Do not park on other levels, as this may result in a $25 administrative fee for improper return. Once parked, locate the key dropbox area near the central elevator bank on Level 4. Each rental agency—including Avis, Budget, Enterprise, Hertz, and National—has a clearly labeled, locked dropbox. Insert your keys and any parking receipts into the correct box. Note that the dropboxes are emptied every 30 minutes by facility staff, and your return time is recorded as the moment you parked, not when you deposit the keys. This means your rental period ends at the parking timestamp, which is captured by the license plate recognition system at the garage entrance. If you park at 11:45 PM but drop keys at 12:10 AM, your billing will reflect the 11:45 PM return. However, if you fail to park in the designated after-hours area, the system may not register your return, potentially leading to an extra day's charge. Always take a photo of your parking spot and the key dropbox for your records. For security, the facility is monitored by 24/7 CCTV, and a courtesy phone is available near the elevators to contact facility security if needed.