Seems to em that Detroit has had a hard way to go since the early 70's when the big three started moving plants out of the area pretty regularly. And yet, they have street car. Amazing.
While this area was much smaller and also much wealthier than what we have left of Historic Springfield ever was, please note the "what we have left". One mansion left is now owned by the Masons, the old Barnett house. Another, owned last by a politically active doctor, is now Alco house, a halfway house. Most of the rest of the larger mansions were bulldozed during the 70's and 80's for urban renewal.
One thing I noticed, other than the houses are to die for, is that the ones left and not restored are in many times worse shape than what until recently was being torn down here in Springfield due to structural issues. Thank you Planning Department and Code Enforcement for changing that!