It seems to me that a street, unless there are signs posted at EVERY ENTRANCE TO THE STREET, is not eligible for this regulation then. I think you should certainly remember his words, lol.(C) A conspicuous notice shall be posted at each entrance to any property set forth in division (A) above, stating:
'Possession of weapons or carrying a concealed handgun is prohibited.'
Even if you only considered "legal" entrances rather than the almost literally infinite number of real "entrances," meaning pretty much anywhere along the side of a road, it would still take an unbelievable number of signs.
Copy this law and carry it with you after making sure it's up to date before you go through there again. The "city owned property" is not refering to public streets that I know of, it's usually talking about town hall or the police station or something. A public street should not quailify, and aren't many if not all of those state funded anyway?