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Today, I’m featuring the pinnacle of Mies’ urban tower typologies: the Seagram Building of 1958.  The wide flange steel mullions on the Lake Shore Drive apartments are rendered in custom bronze extrusions, with thermal breaks at the windows, but all appearing as though they were constructed of arc-welded steel sections (as at the Farnsworth House).  The glass curtainwall is brought proud of the structural column line, allowing the windows to be consistently sized throughout.  A contemporaneous example in Toronto follows:
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