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 Building of Lansing was engaged to design the building, and plans were approved in 1918. Construction began in 1919, but was not completed until 1921. The building served as the state office building until the completion of the first part of a new state government complex in 1953. In 1951, a major fire caused severe damage to the building. In the reconstruction, the seventh floor was removed, leaving the remaining six. The building is now a six-story U-shaped Classical Revival structure, a seventh story having been removed after a major fire in 1951. The building remains in use by the state.