- You own a bit of land; you control that land.
- You rent some land or a building or a part of a building from the owner; you control those premises, with whatever stipulations are in the lease.
- You're alone in your friend's house with his permission; you control that house while he's gone.
- You're driving your cousin's car with his permission; you control that car (and everything in it... just try to say "I'm not in control of this car!" to a cop when he finds drugs in it
)- You're the manager of a business as the owner, or a higher manager, or the like tells you you're in charge for eight hours a day; you control that place.
- Your friend tells you explicitly that you're in control of his land, with whatever conditions he puts on you; you control that land with those conditions (a sort of verbal lease).
- Your dad lets you borrow his old set of golf clubs for the day; you control that property for that day, or essentially until you give it back.
Control of property is exercised independently of ownership (example - your landlord can't enter your leased apartment without your permission, unless there's something in the lease you agreed to); it's also intimately tied in with possession and custody (you're in your friend's house with his permission and he's not around, de facto leaving you in charge; or, the borrowed car example). Without a really huge post, a court would be terribly challenged to refute someone being on "property under the person's control" if the owner of that property stood up and says, "I've given Mr. X control of my property, to the point that he can carry a handgun on those permises." Even using a lower standard like preponderance of evidence in a civil setting, that's a damn near impossible thing for a prosecutor to disprove... how could you refute the owner saying that in open court, so to speak. All of this assumes the owner/leaseholder/dude-with-the-final-say explicitly allows it; a normal employee without explicit permission would not be reasonably assumed to have control over premises in a satisfactory way.
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Personal example - When I went out of town about a year ago for a professional conference, my fiancée came over and walked the dog, watered the plants, and otherwise looked after the place. I left a note with my signature on it saying that she had my permission to be there, spend the night, etc. etc., in the remote-but-possible chance she'd need to call the police or the like. I specifically included on that paper that she could have and use my pistols while she was there, in case something happened. That's unnecessarily comprehensive, I admit, but it's pretty airtight at the same time.
