The former admissions director of one of New York’s most elite private schools has been permitted to go forward with an unusual breach-of-contract suit accusing the school of faking a commitment to diversity in its student body.

In a decision dated April 12, Bronx Supreme Court Justice Dianne T. Renwick ruled that Riverdale Country School’s 2005 letter offering the position of admissions director to plaintiff Shereem Herndon-Brown constituted a contract because it specified a year-long duration.