It's the ones full of administrators you really have to watch out for

Parents fear impact of empty Atlanta school buildings | ajc.com
Parents and community leaders fear a future of more derelict buildings dragging down struggling neighborhoods as 13 Atlanta schools face closure in a bid to balance enrollment and make better use of funding.
Atlanta Public Schools already has 14 empty school buildings, some of which closed in the 1970s.

Okay, you're right to worry about that. APS doesn't have a great track record for re-purposing vacant buildings. All those crack-heads have to live somewhere.

Let's say we have a school like Cook Elementary School. It's running at about half capacity. Where is everybody? The census says there should be plenty of kids. But Cook is a "lower-performing" school, and APS is obligated to allow any parents who want to transfer their child to a better school to do so. Schools like Neighborhood Charter, Parkside (which only has openings because so many of "their" kids are going to Neighborhood Charter) and Drew Charter (where all the principals' kids go). APS can't make them go to Cook. Every parent who can "vote with his feet" is doing that. Every child who can meet the demands of a higher-performance school is getting and staying away from Cook.

Who's left?

The overwhelming majority of the remaining Cook kids are from single-parent households. Mom would like to move her child to a different school, but in order to do that, she'd need a car. (APS will allow you to transfer, but they won't bus you to an out-of-zone school. If you have to ride the school bus, you have to go where they take you.) So, in effect, the kids who remain at Cook are there because they can't leave. Guess what morale is like.

The school board is faced with an unpleasant decision. They can (1) leave the situation as is, spend money they don't have to maintain a half-full school that nobody wants to go to, a school where enrollment is now so low that it doesn't qualify for most forms of state and federal funding; or they can (2) close the school and re-zone the kids into another school...where the parents, teachers, and students don't want them. Since the school they'll be merged into is almost certainly performing better, they won't want their numbers to be dragged down with this massive influx of low-performing students.

And the Cook neighborhood, going nowhere fast, has another big, empty target for vandals and scavengers. Even if the kids get along in their new school just fine, they still have to come home to the Cook area.

In which option are the children better off?

Multiply this times thirteen schools on the superintendent's current "to be closed" list.

UPDATE: Turns out the Cook kids are being split between Centennial Place, Hope-Hill, Parkside and Whitefoord, so maybe there won't be a large enough concentration of them at any one place to destroy their performance scores.