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
Cass Gilbert St. Paul Endicott Building. His goal was to move to New York City and gain a national reputation, but he remained in Minnesota from 1882 until 1898. Many of his Minnesota buildings are still standing, including more than a dozen private residences (especially those on St. Paul's Summit Avenue), several churches featuring rich textures and colors, resort summer homes, and warehouses. The completion of the Minnesota capitol gave Gilbert his national reputation and in 1898 he permanently moved his base to New York. His breakthrough commission was the design of the Alexander Hamilton U.S. Custom House in New York City,