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
C. P. H. Gilbert Gilbert began practicing as an architect in New York City, and received commission to design buildings of all kinds. One of Gilbert's first projects was the design of fourteen brownstone rowhouses that now form a part of the Manhattan Avenue Historic District. Gilbert designed the block for Hoboken developer John Brown in 1886. Another noteworthy building was the 1888 Richardsonian Romanesque mansion at Eighth Avenue and Carroll Street in Park Slope, Brooklyn for Thomas Adams Jr., a chewing gum magnate. From 1893 on, Gilbert had a very large business, which grew steadily. In addition, he was a director or a