by Mila Koumpilova, Chalkbeat, and Jennifer Smith Richards, ProPublica

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More than 4,000 students once crowded DuSable High School, then an all-Black academic powerhouse on Chicago’s South Side. Its three-story Art Deco building drew students with a full lineup of honors classes, a nationally known music program and standout sports teams.

Nat King Cole played the piano in his classroom as a DuSable student. Harold Washington, Chicago’s first Black mayor, studied there. On Friday nights, teenagers zipped through its hallways on roller skates and danced in the gymnasium.

But at the turn of the millennium, enrollment plunged as Chicago closed a massive public housing complex nearby and a growing number of Black families left the city. Amid a national infatuation with smaller high schools 20 years ago, Chicago Public Schools conducted a grant-funded experiment to chop DuSable into three separate schools sharing a campus. What remains today, after that grant money ran out, is an enormous building and, inside, two tiny schools clinging to life.

One has about 115 students and claims the north corridors. The other, with only 70 students, takes the south wings. The inoperable pool is off-limits.

Hundreds of unneeded hallway lockers hide behind decorative paper and student posters of Pakistani activist Malala Yousafzai, Supreme Court Justice Sonia Sotomayor and former first lady Michelle Obama, whose father attended in the 1950s.

The two little high schools in Bronzeville share the same entrance and sports teams, but other things are doubled: two main offices, two principals, two assistant principals, two school counselors. Even though there’s a teacher for roughly every five students, the course offerings are limited.

Chicago Public Schools operates more than 500 schools and spends about $18,700 per student to run buildings that it considers well-utilized. At the DuSable schools, the cost is closer to $50,000 a student.

The DuSable schools are emblematic of an unyielding predicament facing the district. Enrollment has shrunk. Three of every 10 of its schools sit at least half-empty, and they are costly to run.

More critically, there are 47 schools, including those inside DuSable, operating at less than one-third capacity, by the district’s measure. That’s almost twice as many severely underenrolled buildings as Chicago had in 2013, when it carried out the largest mass school closings in the country’s history, Chalkbeat and ProPublica found. The most extreme example is Frederick Douglass Academy High School, which has 28 students this year and a per-student cost of $93,000.

Many of those schools are in historic buildings that need millions of dollars in repairs.

The costs are not only financial. Students in the city’s smallest schools have fewer courses to choose from and often miss out on clubs, extracurricular activities and sports. Chicago’s underenrolled high schools are more likely to have lower graduation and college enrollment rates. They tend to struggle with chronic truancy and higher dropout rates, a ProPublica and Chalkbeat analysis found.

But officials in Chicago have chosen not to confront the problem of the city’s tiny schools. The teachers union and Chicago Mayor Brandon Johnson, who used to be an organizer and legislative liaison for the union, are quick to shut down discussion of downsizing. Widespread anger over the 2013 closures helped fuel the union’s rise to political power over the past decade; the union has also wielded the radioactive closure issue to undermine opponents, notably outgoing district CEO Pedro Martinez.

Union leaders, many community activists and some researchers say closures disrupt displaced students’ learning and harm the city’s predominantly Black and Latino neighborhoods, which were disproportionately affected by that earlier wave of closures. They argue the district needs to do much more to try revitalizing these campuses before it considers shuttering or merging them.

Helping to delay a reckoning: Since 2013, the district has operated under a series of moratoriums on closing schools, including one state lawmakers enacted with strong support from the teachers union. And a statewide school finance overhaul under former Republican Gov. Bruce Rauner increases or at least holds funding steady for districts even if enrollment declines.

Chicago has too many schools for the number of students it serves today, Martinez said in an interview with ProPublica and Chalkbeat. The district is spending too much on aging buildings, and it’s not providing a rich experience for students in many of its tiny schools, he said, adding: “They’re not having joy in that environment.”

But he said he inherited a closure moratorium and worked with school boards that had no appetite for closing or merging schools. “Our footprint is too large,” said Martinez, who leaves the district this month. “Every time somebody wants to address this issue, you see at all levels of politics, nobody wants to do it.”

He said he hopes a fully elected school board that will take over in 2027 will tackle the issue head-on, working closely with the communities it serves.

In a statement, the district noted its building utilization formula is “just one measure,” and it could overestimate available space.

The mayor’s office did not respond to requests for comment.

With public school enrollment declining across the country, a growing number of cities — Milwaukee;........

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