The concern over the Citicorp building resulted from two things:

• A safety calculation that had not considered all aspects. What was the safety concern?

  
  
  
  

• A change in how the building was actually constructed, which differed from the original design. What was that change?

At least five actions were taken to address the problem with the Citicorp tower.

Name and briefly describe each of these (~1 sentence each)

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