The new building was designed by Carson & Lundin, who also simultaneously worked on 600 Fifth Avenue in the nearby Rockefeller Center, and the building was called the Tishman Building. One of its most famous exterior features was the prominent 666 address emblazoned on the top of the building. The other distinctive exterior features are embossed aluminum panels which were originally lit by the "Tower of Light" designed by Abe Feder. The original design included lobby sculptures by Japanese American artist and landscape architect Isamu Noguchi, including the "Landscape of the Cloud" which consists of sinuously cut thin railings in the ceiling to create a cloud effect. The cloud is also carried into a ceiling-to-floor waterfall. The penthouse was occupied by the Raymond Loewy-designed Top of the Sixes restaurant, operated by Stouffer's, which closed in 1996.