While that move could be seen as PR move, as the writers of Curbed stated "the house simply isn't very big". The home is only about 4,000 square feet apparently big, but not mansion big. And at that Curbed further states Mayor Duggan would "lose a third of his living space compared to his old house".
In doing this post I also thought, how much is this residence worth to Detroit? Why isn't this one of those assets that could be sold to get Detroit out of bankruptcy? I'm sure it has been looked at as other city-owned assets were.