Other tenants include Sirius XM Satellite Radio, whose headquarters and broadcast facility are in the building, and the law firm White & Case. The building was previously the headquarters of McGraw-Hill Financial. It is the 80th tallest building in New York. The "Z" Building, the shortest and the youngest, is 1211 Avenue of the Americas with 45 stories (592 ft).
The "Y" is 1221 Avenue of the Americas, which was the second tower completed (1973) and is the second in height (674 ft and 51 stories). 1251 Avenue of the Americas is the "X" Building as it is the tallest at 750 ft (229 m) and 54 stories, and was the first completed, in 1971. Their letters correspond to their height. Their plans were first drawn in 1963 by the Rockefeller family's architect, Wallace Harrison, of the architectural firm Harrison & Abramovitz. The building was part of the later Rockefeller Center expansion (1960s–1970s) dubbed the "XYZ Buildings".
The tower's lobby is clad in dark red terrazzo and red marble, with aphorisms by Plato and John F. The building is set back 115 feet (35 m) from Sixth Avenue, with a sunken courtyard dominated by Sun Triangle, an 49-foot (15 m) abstract steel sculpture by Athelstan Spilhaus. The facade has no decoration and consists of red granite piers alternating with glass stripes to underline the tower's verticality. The 51-floor structure has a seven-story base and a simple, cuboid massing.
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