The floors are also designed to bear an extremely large amount of weight.
The building continued to function as AT&Ts long distance telephone exchange until 1999.
After that AT&T vacated the building and moved to another a few blocks away.
There is another one at Houston, for instance.
AT&T Building at Houston.
One wall is completely devoid of windows.
Photo credit:Wolfgang Houston/Panoramio
AT&T Building at Houston.
Photo credit:Bobby Burning7Chrome Quine/Panoramio