The external walls are 70cm (27inches) thick. It is approximately 120m long by 32m wide. By the mid 19th century, cast iron columns were common in warehouse and industrial buildings, combined with wrought or cast iron beams, eventually leading to the development of steel-framed skyscrapers. The top portion measures 6" x 6" and the bottom portion measures 8½" x 8½" In good. It is very robust and structurally over-designed for its new speculative use which includes the upper storey as offices of variable size. They each stand approximately 2½" tall. Antique Cast Iron Zimmerman Wood Column Bases Description Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 A lot of three cast iron Zimmerman Bases for wood columns. Circular hollow cast iron columns are placed on an 8m grid. The cast iron roof beams span 8m between columns and have openings in the web, and the lower flange is in the shape of an … Cast iron was also used sometimes for decorative facades, especially in the United States, and the Soho district of New York has numerous examples.