To avoid a hefty tax bill, the Hadars had to invest a major part of the proceeds in a venture like Citigroup Center.

On 8 December 2006 a man opened fire in a law office located on the 38th floor of the Citigroup Center.

"You have to hope it's true," Keith Kirlew, a broker assistant who also works in Citigroup Center, said of the warning.

One morning this month, a mother and her boy were placing a breakfast order at the Market Cafe in Citigroup Center.

And now the Hadars are buying Citigroup Center.

In any event, the sale of Citigroup Center is akin to three-dimensional chess.

From the beginning, the Citigroup Center was an engineering challenge.

It occupies the lower floors of the Citigroup Center.

The problems that the 1.6 million-square-foot Citigroup Center faced in the summer of 1978 were, if possible, even more frightening than the potential for a simple collapse.

Soon afterwards, these elevators were removed because of their low popularity; however, the Citigroup Center adopted this same idea in the 1970s.