The Carnegie Mansion, designed by Babb, Cook & Willard, is completed. Andrew, Louise, and their five-year-old daughter, Margaret, arrive at 2 E 91st Street for the first time on December 12. Two townhouses were built just as the Carnegie Mansion was being completed—Nos. 9 and 11 E 90th Street.
In April, Margaret is married in the mansion. On August 22, while Andrew and Louise are away for the summer in Massachusetts, Andrew dies of pneumonia.
Louise purchases the townhouse adjacent to the mansion and it becomes home to Margaret, her husband Roswell Miller, and their growing family.
Calvin Hathaway is hired as assistant curator at the Cooper Union Museum, and professionalizes the museum’s practices implementing an object numbering system and thematic exhibitions as well as incorporating modern design into the museum’s collection.
Louise dies on June 24, with her daughter by her bedside, leaving the mansion to the Carnegie Corporation.
The Carnegie Corporation leases the mansion and 9 E 90th Street (now known as the Miller House) to the New York School of Social Work (renamed the Columbia University School of Social Work in 1963).
Cooper Union announces its intention to disband the museum. The committee to save the Cooper Union Museum is formed, and its 260 members rally to keep the Cooper Union collection together and in New York City.