No, this is very typical. I realize Detroit doesn't have many high-rises being constructed so people are easily duped by scare stories about how "Dan Gilbert is just pushing dirt around!" but actually it takes a good portion of time to do the foundation work and then to finish the building. The steel will go up very quickly and rapidly look impressive once they hit that stage of the project.
Here's a building whose construction I'm familiar with [[it was on my commute for a number of years when I lived in the DC area). It's less than half the height of Hudson's, and does have a big footprint but nothing comparable to the additional pedestal building in Gilbert's project: https://en.wikipedia.org/wiki/1812_N_Moore
Groundbreaking was October 2010. The tower topped out in March 2013. It took them what felt like a very long time [[2010-2012) to tear down a McDonald's, dig a big hole, do a bunch of utility and foundation work etc. But the steel went up in the space of probably a year or less.
Gilbert broke ground at Hudson's at the very tail end of 2017, and from all accounts intends to start building up later this year [[2019). Nothing at all unusual, and perhaps even rapid for a project of this scale.
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