Bethlehem Steel spared no expense in their new skyscraper headquarters. The building was built in the shape of a cross (or plus-sign) rather than a more conventional square, in order to create more corner- and window-offices. The architect for Martin Tower was Haines Lundberg Waehler. It was built by George A. Fuller Construction Co. of New York, which also built the Flat Iron Building in New York in 1903, the CBS Building in New York in 1963 and 1251 Avenue of the Americas at Rockefeller Center in 1971. Under the initial plan, Bethlehem Steel was to build a second Tower, which is why some people refer to it as "Martin Towers." An Annex was built, intended to connect the two Towers, but the second Tower was never built.