1251 Avenue of the Americas
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The building was part of the later Rockefeller Center expansion (1960s–1970s) dubbed the "XYZ Buildings" Their plans were first drawn in 1963 by the Rockefeller family's architect, Wallace Harrison of the architectural firm, Harrison and Abramovitz. Their letters correspond to their height. 1251 is the "X" Building as it is the tallest at 750 ft (229 m) and 54 stories, but was the second one completed (1971). The "Y" is the McGraw-Hill Building, at 1221 Avenue of the Americas, which was the first completed (1969) and is the second in height (674 ft - 51 stories). The "Z" Building, the shortest and the youngest, is the Celanese Building at 1211 Avenue of the Americas with 45 stories (592 ft). 1251 is the second-tallest building in the whole of Rockefeller Center, after the Comcast Building.
Despite being one of the 100 tallest buildings in the United States, 1251 Avenue of the Americas is almost impossible to see from more than just a few blocks away as it is flanked on all sides by buildings over 500 feet tall. The result is that even though 1251 Avenue of the Americas is approximately as tall as the tallest buildings in cities like Boston or Minneapolis, it has almost no presence on the New York City skyline.
In 1989, ExxonMobil Corporation announced that it was moving its headquarters and around 300 employees from New York City to the Las Colinas area of Irving, Texas. Exxon sold the Exxon Building, its former headquarters, to a unit of Mitsui Real Estate Development Co. Ltd. in 1986 for $610 million. John Walsh, president of Exxon subsidiary Friendswood Development Company, stated that Exxon left New York because the costs were too high. Its New York offices moved to Brooklyn; it no longer retains a presence in Rockefeller Center.
Inside, on the western end of 1251's atrium hangs an artist-authorized replica of a tapestry Pablo Picasso created for the ballet Mercure, the original of which hangs in the Musée National d'Art Moderne in Paris, France. It was created specifically for 1251, as per the plaque beneath it.
- Harman International Industries
- NHL National Hockey League
- DLA Piper (US)
- All Nippon Airways maintains a sales office and a ticketing office at Suite 820 on the 8th Floor.
- Probitas Partners investment bank, Suite 2390 on the 23rd Floor.
- Toshiba America, Inc, headquartered in Suite 4110
- Canadian Consulate General in New York 
- Natixis US CIB
- Bank of Tokyo
- Lowenstein Sandler
- MLV & Co.
- Avon Products
- Canoe Ventures
- Paulson & Co.
- Moore Capital Management
- UBS Financial Services Inc.
- 1221 Avenue of the Americas (McGraw Hill Building)
- 1211 Avenue of the Americas (Celanese Building)
- List of tallest buildings in New York City
- List of tallest buildings in the United States
- Pearson, Anne and Ralph Bivins. "Exxon moving corporate headquarters to Dallas." Houston Chronicle. Friday October 27, 1989. A1. Retrieved on July 29, 2009.
- ANA City Offices/Ticketing Offices North America/Hawaii/Guam. All Nippon Airways. Retrieved on December 22, 2008.
- ANA Directory (as of June 30, 2005). All Nippon Airways. Retrieved on December 22, 2008.
- Contact ANA. All Nippon Airways. Retrieved on December 22, 2008.
- Contact and Office Information - Canadian Consulate General in New York. Retrieved on August 19, 2010.