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Originally Posted by donnie
Correct me if I'm wrong but when they say topping off they are referring to the core being complete, but excludes the mechanical floors or in this case the lantern?
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The definition of topping out is the completion of the highest structural feature. So generally in steel buildings its the last beam on the final floor, and in concrete buildings its either the core or the last deck pour.
In the end it's nothing more then a media event, thus why ground is broken on some projects and construction doesn't actually start until a while later, same with topping out; the "last" concrete pour/beam is completed but that doesn't mean that's the highest point, or last concrete pour or last steel beam that will be placed.