Tyshaunna Roberts, 22, sexually abused a 13-year-old girl, prosecutors said.
Neighbors and Community Board 8 members shot down the tony private school's zoning change request.
A well-to-do woman and her boyfriend were charged Saturday for housing explosive substances.
The NYPD asks anyone with information alleged sexual abuse at Horace Mann call the Special Victims Unit.
John Thomas, 28, who had worked in schools in Gramercy and the Upper West Side, was sentenced to prison.
Trinity School, on the Upper West Side, is New York's best prep school, according to Forbes.
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