I wish these terrible humans would turn over their parts of the Packard Plant to the new owner. You technically own a small part of a large derelict factory that occasionally partially collapses, and that is famous for being on fire frequently. Let it go.
Creepy absentee speculators/slumlords do not get enough attention as a problem that keeps Detroit from recovering quickly. More of the focus on vacancy needs to be not just on the symptom, the buildings, but on the cause, which includes the owners. Some vacant houses are just owned by somebody who used to live there and couldn’t afford to stay, but some vacant properties are owned by slumlords with lawyers, who never so much as board up a door but who awaken the second it seems like they could squeeze a dime out of somebody else’s positive efforts.