Another good source is: http://www.damninteresting.com/a-potentially-disastrous-desi...

Apparently it costed $8 million to repair.

Joe Morgenstern's 1995 _New Yorker_ article "The Fifty-Nine Story Crisis" is also an excellent telling of this story.

http://people.duke.edu/~hpgavin/cee421/citicorp1.htm