The mansion Andrew Carnegie bought to protect his property value

Andrew Carnegie purchased this site in 1898 to protect the value of his nearby mansion. In 1901, William D. Sloane acquired the site from Carnegie and commissioned the house for his daughters.

Architects Warren and Wetmore designed the five-story Beaux-Arts mansion, which was completed in 1905. The limestone facade is rusticated on its lowest two stories and features French-inspired detailing around the double-height windows and balcony on the third story. The house features French-style interiors, including an oval entrance hall that connects the floors.

The Burden family lived in the home from 1905 to 1933. The contents of the house were auctioned by Parke-Bernet, and the Convent of the Sacred Heart purchased the mansion in 1940. The Convent used the house as a boarding school until 1966, at which point they converted the house into classrooms.

Today, the mansion is a New York City designated landmark and is listed on the National Register of Historic Places. It remains internally connected to the adjacent Otto H. Kahn House. The mansion was renovated in the late 20th century while preserving many of its interior architectural details.

Sources: Wikipedia, OpenStreetMap, Wikidata, Wikimedia Commons