[Answer] What is the largest office building in the U.S. by area?

Step 1 : Introduction to the question "What is the largest office building in the U.S. by area?"

...Located in Arlington, Virginia, the Pentagon serves as the headquarters of the U.S. Department of Defense, and its size is thanks to building outward instead of up. The building covers 6.6 million square feet of office space spread across five sides that are each 921 feet long. A lap around the outer corridor is close to a full mile — the halls are so long that before phones became ubiquitous, messengers would often travel on roller skates.

Step 2 : Answer to the question "What is the largest office building in the U.S. by area?"

The Pentagon:

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