The latest residential skyscraper being built now in NYC ( http://nymag.com/intelligencer/2019/09/nyc-tallest-building-central-park-tower.html ) reminded me of this: https://www.businessinsider.com/skyscraper-index-skyscrapers-signal-financial-recession-2012-1
LOL, I just got through skimming the accompanying article "The 21 Most BIZARRE Economic Indicators" WHAT A HOOT!!! Thanks for sharing, lots of interesting data out there, eh! Best Regards, Jon https://www.businessinsider.com/21-bizarre-economic-indicators-2011-11
Most of those indicators are very broad in time-length. Skyscrapers tend to happen in periods of excess, which are toppy periods when the masses feel rich. It's one of the ultimate bullish sentiment gauges. I'd take it far more than the "hot waitress" one, which has had Hooters and Twin Peaks, etc. around for a very long time, etc.