i went to my local township building and asked the nice lady at the desk about a property the township maintains, this was an open empty lots, anyway i told her my intentions and the nice lady started to list a bunch of properties the township owns and maintains some being vacant lots that were zoned as future tot lots that i was unaware of. after several minutes of chit chat she gave me her blessing to go hunt them, including the township building itself.
in my area i hunt....
state parks
township parks
schools
curb strips
fishin holes along creeks/river/lakes
township buildings
firehouses