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The architectural design team restoring the Waldorf Astoria hotel aims to be painstakingly precise. When it comes to the color of the bricks, there is only one option: Waldorf gray.

For the last year, a team at Skidmore, Owings & Merrill LLP has been diving into architectural archives, researching photos and, in some cases, unearthing pieces stored for decades to plan a restoration of the landmark exteriors as well as the…