Follow one of Fire Island’s quaint footpaths away from the ferry dock, past modest cottages and better-appointed vacation homes, to an elegant modern beach house that extends across three lots. A composition in bold, unadorned planes, it has a perimeter of green and two separate entrances, each outfitted with the long ramps that are the local custom.

Its most interesting feature, however, is not architectural, but financial. The house, which is owned by John Sexton, the president of New York University, was bought with a $600,000 loan from an N.Y.U. foundation that eventually grew to be $1 million, according to Suffolk County land records. It is one of a number of loans that N.Y.U. has made to executives and star professors for expensive vacation homes in areas like East Hampton, Fire Island and Litchfield County, Conn., in what educational experts call a bold new frontier for lavish university compensation.

N.Y.U. has already attracted attention for the multimillion-dollar loans it extends to some top executives and professors buying homes in New York City, a practice it has defended as necessary to attract talent to one of the most expensive cities on earth. Mortgage loans to Jacob Lew, a former N.Y.U. executive vice president, part of which was eventually forgiven, became an issue during Mr. Lew’s confirmation hearings as treasury secretary this year.

Universities in similar circumstances, like Columbia and Stanford, also have helped professors and executives with home loans. Aid for vacation properties, however, is all but unheard-of in higher education, several experts in university pay packages say.

“That’s getting to be a little too sexy even for me, and I have a good sense of humor about these things,” said Stephen Joel Trachtenberg, a former president of George Washington University who has publicly defended high salaries for professors and university executives. “That is entertaining, actually. I don’t think that’s prudent. I don’t mind paying someone a robust salary, but I think you have to be able to pass a red-face test.”

Richard Revesz, who recently ended a decade as the dean of New York University Law School, lives with his wife, an N.Y.U. law professor, in a handsome West Village town house that was financed by N.Y.U. They also have a home on more than 65 acres near the Housatonic River in Litchfield County, also helped by an N.Y.U. loan, according to land records in both locales. According to the university’s most recently available tax return, they owe the university $5.7 million altogether.

Senator Charles E. Grassley, Republican of Iowa said,“Universities are tax-exempt to educate students, not help their executives purchase vacation homes,” he said in a statement on Monday. “It’s hard to see how the student with a lifetime of debt benefits from his university leaders’ weekend homes in the Hamptons.”

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