Checking in in the Tower Concierge Lounge on the 10th floor should enhance your chances of getting an upgrade. If this is some kind of a special occasion, you can e-mail your request to their Accommodation Request Team at
[email protected] or call them directly at 202-639-5789. Also, the Concierge can be reached at
[email protected] or by calling directly at 202-639-5712.