Another option would be subdividing a piece of real estate. Zoning approvals are generally needed to create buildable lots. But depending on what the registry of deeds will let you record [0], you could divide the area into tiny individual parcels, each singularly owned.

Of course if you did any of these hacks "at scale" I'd imagine the city would balk, court case, judge not finding equity in your hack, etc. The goal is pointing out perverse incentives that will inevitably crop up inadvertently, unless the bill diligently accounts for the new weird legal contours it'd create.

[0] I'm assuming that ownership being recorded would be required to register to vote, as opposed to a voter registration being allowed to say "trust me I own real estate in this city via unrecorded deed"