There will be no towns owned entirely by single enterprenuers in the absence of the unanimous consent of everyone in that town deciding to sell or donate their own portion to them. Good luck finding such unanimous consent, getting literally everyone in the town to sell their land and property to the same person (hint: you can’t!). Otherwise, you’re stuck recognizing that the town as such is made up of multiple individual owners.
So please explain to me how you can manage to get an entire city, as one exists today, into the ownership of a single entreprenuer without effectively claiming ownership over other people’s property within the city. You simply can’t.
Do you know what we call towns owned (at least implicitly) by a single entity today? A city-state. The city government effectively claims ownership over the entire city, while in reality there are a multitude of individual owners of individual plots of land and property within that city. There is no way to get such a property claim over the entire city in the absence of state power or some kind of crime.