Nintil - Building skyscrapers, and spending on major projects

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How fast can buildings be built these days? I took all buildings taller than 200m from here and did some plotting. Data quality was a bit bad, it only states construction time a whole years, not months, and they may not be accounting for start/stops. Nor is it fully comprehensive, I had to add most of the Broad Group's buildings data. BG's are smaller than the others, so they break the 200m criteria. But I've included them because of how unique they are -they are built really fast-, and because they claim to be able to build a tall (>800m) tower with the same techniques, in 90 days. In the plo

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