It’s not used for buildings, parking, events, nothing. Just a large patch of land that nature continuously tries to take back only to be cut down and replaced with concrete.

Do you know of any local policies around development, land use, and taxes? Might be if the lot is ‘developed’ its taxed a different rate than other land. Keeping it paved might mean “developed enough” and the dude’s just squatting the rights to the property till the value goes up enough.