Actually, one of the halls I attended was a triplex.
There was a no trespassing sign in the front.
As I understand it, it was put up only after apparently kids were riding their bikes through the property, mainly the driveway, as there was access to another street through a closed gate. (Bikes could easily go around it.)
I don't think the kids caused any trouble, but the driveway wasn't made to be a public road.
And so the sign went up. It's the only time I've ever seen at a hall.
Perhaps if there is concern of vandalism, this may also occur.
CoC