'I'm not sure you can demand rent from someone who has not signed and agreed to a lease.'
That is a true statement there. If the city claims to be the landlord then they also have the liability to fix the homes that they claimed to own and mow the yards.
Personally I would sell the property to the State, but demand payment be made in gold and silver coin like it states in the US Constitution, Article 1, Section 10.
"No State shall make anything but gold and silver COIN a payment of debt."
I mean, I can't go charging people rent for property I don't own.
The Supreme Court ruling didn't mean that they own the property, only that they have the right to buy it.
That being said, I think it would take an Army and a bulldozer to move me out of my house, and I would almost certainly be willing to take someone out with me. And if a policeman says he's just doing his job, I would remind him of Cool Hand Luke's words on his way into the hole, "Calling it your job don't make it right."