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I’m sorry but there’s no way there would only be 12 feet of mechanical and roof/crown space above the highest occupied floor. I think your info/source is a bit off. Either the highest occupied floor is 1,388 ft, in which case the full height would be more than 1,400 ft. Or the full height is 1,400 ft, but the highest occupied space is lower.
Buildings of this size have on average, I think like 50-100 feet of mechanical space above the highest floor.
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Magnificent!
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Matthew, be careful with what you post here. Remember our other friend a few years ago that got in trouble for saying too much about a building. It’s not worth it. We’ll find out soon enough!
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Thanks, Matt.
Is that, in fact, a waterwall on either side of the entrance on Madison? It certainly looks like one.
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If that’s the case the canopy over the entrance has to clear the wall. If they are water walls that would really be an impressive wow factor.
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Turn the phone sideways.
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There appears to be a gap between the canopy and the waterwall.
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A slightly different Christmas greeting
Credit : Xing Lin on SSC NEW YORK | JPMorgan Chase World Headquarters | 423m | 1388ft | 60 fl | U/C | Page 47 | SkyscraperCity Forum
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JRF, Matt (or anyone else who knows):
With three cranes, do you think that this will rise one floor per week?
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there are four cranes.
a floor per week is a decent guess for further up the building. For this first setback, the steel is too big for that speed.
plus there will be time for adding the cocooon and jumping the cranes.
there are also going to be several transfer levels that will take more than average time.
my expectation is that this will move very speedily. Above the table top this building is fairly straightforward.
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Thanks. You’re a great asset to this forum.
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I agree, words right out of my mouth 
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You also are a great resource for this forum, Matt.
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As far as I can see, the first columns of the steel core are in place.
Pics by Michael Young
A PDF file for as structural details about the building:
https://cryptome.org/000/JP-Morgan-270-Park-Avenue-NB-Structural-Peer-Review-2020-09-24.pdf
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This render shows you how big 175 Park Avenue and Tower Fifth would be compared to 270 Park, which is 1400 ft!
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As a reference point, this shows how absolutely massive these new buildings would be in Chicago. Incredible!
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One more crane to be erected! 
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