AD Classics: Citigroup Center,© Flickr user paulkhor

AD Classics: Citigroup Center,© Flickr user Steven Severing-Haus

AD Classics: Citigroup Center,© Flickr user Steven Severing-Haus

AD Classics: Citigroup Center,© Flickr user Jeff Stvan

AD Classics: Citigroup Center,© Flickr user Axel Drainville

AD Classics: Citigroup Center,© Flickr user Timothy Vogel

AD Classics: Citigroup Center,© Flickr user Reading Tom

AD Classics: Citigroup Center,© Flickr user tsaiproject

AD Classics: Citigroup Center,© Flickr user Timothy Vogel

AD Classics: Citigroup Center,Typical Floor Plan. Image © viewthespace.com

AD Classics: Citigroup Center / Hugh Stubbins + William Le Messurier

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AD Classics: Citigroup Center / Hugh Stubbins + William Le Messurier