The National Education Policy Center, an anti-school choice and pro-union outfit located in Colorado, attacks Realtors in their latest newsletter.  They write,

How do renters or buyers judge the quality of the schools zoned to their prospective homes?
Often it starts not with schools or teachers or students, but with the real estate industry.
Two recent pieces of investigative journalism call attention to a prominent flaw with this system: Realtors and real estate websites alike share assessments that downgrade schools that serve higher percentages of low-income and minority students, while also serving to maintain segregated housing patterns by steering Whites away from districts that serve students of color.
Realtors should object publicly to these accusations, which call into question the integrity of the profession. Of course, if families could choose their schools, segregated housing patterns would not necessarily reflect neighborhood demographics.