<p class="ingestion featured-caption">The Upper East Side mansion was built in 1901 at the height of New York's Gilded Age.Evan Joseph for Sotheby's International Realty</p><ul class="summary-list"><li>An <a target="_blank" class href="https://www.businessinsider.com/new-york-city-neighborhood-where-billionaires-celebrities-live-2018-2">Upper East Side</a> mansion built during the <a target="_blank" class href="https://www.businessinsider.com/gilded-age-historic-mansion-photos-2024-5">Gilded Age</a> is for sale for $65 million.</li><li>The seven-bedroom, 16-bathroom townhouse features ornate details and a massive floorplan.</li></ul><p>One of Manhattan's last surviving <a target="_blank" href="https://www.businessinsider.com/lynnewood-hall-photos-gilded-age-mansion-with-tragic-titanic-ties-2024-6">Gilded Age mansions</a> — spanning about 18,000 square feet with a marble foyer, three terraces, and 14 fireplaces — is on the market for $65 million.</p><p>Located at 15 East 63rd Street, the historic townhouse was designed by architect John H. Duncan and built in 1901 by financier and philanthropist Elias Asiel.</p><p>According to the <a target="_blank" href="https://www.sothebysrealty.com/eng/sales/detail/180-l-1182-dyfedy/15-east-63rd-street-lenox-hill-new-york-ny-10065?mp_agent=766-a-df190226091310151097">listing</a>, Duncan was one of the most influential architects of the late 19th century and the designer of Grant's Tomb, the final resting place of Ulysses S. Grant also located in New York City.</p><p>Listed by Louise Beit and Sotheby's International Realty, the home is described as "a glistening survivor, one of the few remaining and most architecturally intact [mansions] of its Gilded Age splendor on the Upper East Side."</p><p>Here's a look inside the historic home and its tumultuous history.</p>