The Wyckoff House has been standing strong in Brooklyn since 1652, where it now operates as a museum.
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The Andrew Carnegie MansionA few Gilded Age-era mansions—such as the Frick Collection and the Cooper Hewitt design museum—remain intact on the Upper East Side.
UPDATED, Jan. 14, 2021, 6:10 p.m.: Brooklyn has cracked the $25 million club. Billionaire Vincent Viola and his wife Theresa have sold their sprawling Brooklyn Heights mansion for $25.5 million, according to property records, smashing the borough's record for the most expensive home ever sold.
Located on one of the most the iconic streets in the world, the Duke House was built during the Gilded Age and remains as one of Fifth Avenue's last true mansions, according to New York City Landmarks Preservation Commission.