The Bronx private school will charge tuition of $31,200 next school year for sixth- through 12th-graders, more than $3,300 higher than this year's rate at the esteemed university. Bus rides not included.

Riverdale is among several elite New York City high schools that have surpassed or are approaching the $30,000 mark.

"By the year 2015, these schools will be $50,000, and they would still have wait lists," said Amanda Uhry, head of Manhattan Private School Advisors, who credited the demand for private schools to failing public schools. "It's like a feeding frenzy around here."

Dozens of people are often on waiting lists to get into the schools, even as prices rise.

Manhattan's Trinity School will soon charge $30,170 a year for seniors, private-school observers say.

And plenty of schools are just a hair under the $30,000 threshold.

The Horace Mann School in the Bronx, for instance, will charge about $29,000 for the 2006-07 school year.

The elite schools are sought after because they have small classes and top-notch teachers, not to mention high-quality facilities, especially for athletics. But perhaps more than anything, the most elite offer their reputations, something that could give an edge to students applying to top-tier colleges.

"Tuition, however high or low it may be, or whatever it is, it still costs us more than that to educate a student," said Mary Ludemann, a spokeswoman for Riverdale. "We are trying to raise faculty salaries, teachers' salaries. The only way to do that is to raise tuition."

In many ways, the higher tuition bills are not a surprise. New York is by far the most expensive place in the country to send a child to private school, driven by the high cost of living in a city where apartments routinely sell for $1 million and it can cost a small fortune to park your car.

The median 12th-grade tuition in Manhattan independent schools — a group not including parochial schools — was $27,200 in 2005-06; nationwide it was $16,970, according to the National Association of Independent Schools. But it is predictably highest in areas with higher-than-average cost-of-living expenses, reaching $24,167 in Washington, D.C., and $24,940 in San Francisco, for instance.

"New York is the only region of the country where there are numerous schools in that price bracket: close to $30,000," said Myra McGovern, a spokeswoman for the association.

It's not just high schools that have large tuitions. At Riverdale, preschool tuition cost $24,500 for the current school year, while kindergarten through fifth grade is $27,150.

While the cost of living in New York is a big reason for the jump in tuition, some schools are offering more specialized programs and classes that increase the cost of instruction.

Schools define tuition in different ways. Some do not include bus transportation; others charge extra for things such as books and activities.

Victoria Goldman, a parent of a child at Riverdale and author of a leading guide to New York private schools, said the schools are attractive even to financially stretched parents.

"The level of education at these schools is so fabulous," she said.

More education headlines...