As much as I complain and dislike their parking deserts and urban prairies, the sidewalks and streets surrounding those lots are among the most clean and taken care of in Detroit.
Most vacant buildings don't make money anymore. You can't just sit on something hoping you can flip it in the near future. That being said, if their is a way to make money off any of these mentioned buildings, the Ilitch Family should have no problem figuring it out, since they have access to more data and information about the area than just about anyone else in Metro Detroit.
Bookmarks