Life of a Mansion tells the story of the building that Cooper Hewitt, Smithsonian Design Museum calls home. It details how Louise and Andrew Carnegie’s grand but functional Fifth Avenue mansion—which was pioneering in its design, with an electric elevator and modern steel-frame construction—was constructed. The book features the rooms in which Carnegie conducted his business and philanthropic endeavors, and where the family and staff lived and entertained throughout the mid-20th century. It also surveys plans for the 1976 renovation by Hardy Holzman Pfeiffer (when Cooper Hewitt first opened as a public museum) and the building’s latest extraordinary renovation by Gluckman Mayner Architects, executive architect Beyer Blinder Belle and world-renowned Diller, Scofidio + Renfro, which positioned Cooper Hewitt as a truly 21st-century design museum. With an engaging narrative illustrated by 200 photographs, maps, floor plans, and letters, Life of a Mansion chronicles the 110-year history of the National Landmark building, as well as the evolution of the museum from its establishment by the Saran and Eleanor Hewitt in 1897 to its status post-renovation in 2014 as the site of the nation’s design authority.