Let’s say you live in Baltimore but also own a house in a small resort town. In Delaware, that town can decide to let you vote in Baltimore and at your vacation home.
Legally they do this by saying city elections are open to both residents and property owners (regardless of where they live).
That all seems pretty reasonable for small resort towns. But a lot of property is owned by trusts, llcs, and corporations. So this would include those property owners as well.