Astor House was a mansion on Fifth Avenue in the Upper East Side neighborhood of Manhattan, New York City. It was located at 840 and 841 Fifth Avenue, on the northeast corner of 65th Street, completed in 1896 and demolished around 1926.
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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.
With more than 600 acres of landscaped property and a palatial Beaux-Arts mansion, the Hyde Park estate came to symbolize the enormous wealth accumulated by a privileged few during the Gilded Age. Today, the Vanderbilts' Hyde Park home is preserved as Vanderbilt Mansion National Historic Site.
The biggest house in the world is the Istana Nurul Iman, with a massive 2.15 million sq ft (200,000 m2). It is located in Brunei and serves as the residence of the Sultan of Brunei, Hassanal Bolkiah. This huge mansion has a 5,000-person banquet hall.
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.