I don't think the height of the tower crane shaft has anything to do with how much weight it can lift, but I might be wrong about that. I would assume all of the support is in the boom suspension cables and counter weights.
If they're jumping the crane by two sections that'll be another 40 feet tall, since each section is 20 feet each. I was thinking recently they would probably have to raise the crane a little to accommodate the mechanical penthouse structure.
I was out at the Travis County Expo Center today, so I had a nice view of the skyline. I took some photos today and will tomorrow also.
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