What is the tallest structure in NYC outside of Manhattan?

The Citicorp Office building in Queens is indeed the tallest structure in New York City located outside of Manhattan. Standing at 673 feet, it surpasses other prominent buildings in the boroughs, making it a defining characteristic of the Queens skyline.

The Empire State Building and One World Trade Center are both iconic structures, but they are located in Manhattan and thus do not qualify for this question. The Brooklyn Bridge, while a significant and historic landmark, does not reach the height of the Citicorp Office building. Therefore, the choice of the Citicorp building appropriately identifies the tallest structure situated outside of Manhattan.