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In November 2021, The Newport Daily News of Newport, Rhode Island, reported that filming took place in February 2021. Previously, filming was scheduled to take place in March 2020, but there were production delays due to the coronavirus pandemic. Several historical mansions were utilized for filming, such as Chateau-sur-Mer, The Elms, and The Breakers.
Source: https://www.distractify.com/p/where-was-the-gilded-age-filmed
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