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Nevertheless, Metropolitan Life North Building is not an example of a structure, which was shortened as construction work stopped when it reached a certain height.
So no engineering work was used to reduce its height!

In my definition a structural shortening is a height reduction of a structure that already exist - as in my chimney examples.

In Berlin, there is on Müggelberge a TV tower, which was never topped out as, if one would have done it, it would have been an enormous hazard for air traffic.