By Samantha Schmidt

The New York Times

When the Rockefeller University in Manhattan wanted to expand its campus, it bumped up against the same problem other developers in the jam-packed city face: a lack of space.

“The east skyline of New York City is completely changing,” said David Moskovich, 21, an intern with Lehrer L.L.C. a construction consulting firm for the project. He was among 25 people perched on a campus rooftop. “The whole thing is a feat in modern engineering,” Mr. Moskovich said. The yellow, red and white boom on the Chesapeake 1000 can reach as high as a 21-story building and carry up to two million pounds. The heaviest metal structures for this project weigh 1.5 million pounds, Mr. Zegler said.

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