In the moments before Mr. Craig's reveal, we made our way through the bowels of the building, past the 41, 000-square-foot former mail-sorting room where, at one time, 90% of the mail in the U.S. was processed.

WSJ: Setting Stages Fit for Bond

Room 77 also has other search features for groups who get special rates such as sorting by AAA, seniors, military, or government.

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