Something you may want to consider: Do you have events that use both the Ball Field and the building? If not, you might want to make the ball field it's own location. That way it can't be tied with with a "Entire Facility" option for the building.
The downside is that you can't have an event with two locations. So if you do have an event that needs the ball field and building, then you have to create another event, that's normally hidden from the members to reserve the additional resource. (I'd use the same calendar that you use for private events such as weddings.)
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