Final answer:
The National Headquarters Building dedicated in 1964 is not specifically identified in the references provided, which discuss various architects and buildings such as Ludwig Mies van der Rohe's designs and the AT&T Building by Philip Johnson. The Ariel Rios/William Jefferson Clinton Federal Building and its controversial murals are also noted. Further research would be required to directly answer the question about the National Headquarters Building.
Step-by-step explanation:
The National Headquarters Building dedicated in 1964 is not specifically mentioned in the reference information provided. However, several key buildings and architects are highlighted. Notably, the architect Ludwig Mies van der Rohe designed significant structures such as the IBM Plaza in Chicago and the Martin Luther King Jr. Memorial Library in Washington, D.C. Another prominent architect mentioned is Oscar Niemeyer, known for his modern architecture like the Cathedral of Brasilia and the United Nations Headquarters in New York City. The 550 Madison Avenue building, formerly known as the AT&T Building in New York, was completed in 1982 by the architect Philip Johnson. Lastly, the Ariel Rios Federal Building in Washington D.C., renamed the William Jefferson Clinton Federal Building, was originally a post office constructed in 1934 and is known for its controversial murals.
For the question asked, without specific information about the National Headquarters Building from the references provided, it would be recommended to conduct a targeted search for that building using the year 1964 and the relevant architectural or organizational history resources.