Cass Gilbert Minnesota, and the Library of Congress. Cass Gilbert is often confused with Charles Pierrepont Henry Gilbert, another prominent architect of the time. Cass Gilbert designed the famous Woolworth Building skyscraper on Broadway for Frank W. Woolworth, while Woolworth's personal mansion was designed by C. P. H. Gilbert. The Ukrainian Institute building on Manhattan's 5th Avenue is the work of C. P. H. Gilbert, and often incorrectly attributed to Cass Gilbert. Cass Gilbert should also not be confused with his son, architect Cass Gilbert, Jr. Notes Further reading Cass Gilbert Cass Gilbert (November 24, 1859 – May 17, 1934) was a
Lewis Cass Ledyard Burlingham, Edward Julius Berwind, Morgan J. O'Brien, William Sloane Coffin Sr., Herbert Eustis Winlock, Arthur Curtiss James, Frank L. Polk, Cass Gilbert, Edwin H. Anderson, Harry M. Lydenberg, Keyes Metcalf, John G. Milburn, and Devereux Milburn. His estate was valued in excess of $10,000,000 upon his death. Through his son, he was the grandfather of Lewis Cass Ledyard III (1911–1990), Dorothy Cass Ledyard, who first married Hugh McLeod Fenwick (1905–1991) (he divorced her in 1931 to marry Millicent Vernon Hammond), and later, Richard Allen Knight (d. 1947), in 1933, and Ruth Emery Ledyard, who married William de Rham, a great-great