Even the landscape is carved up by class. From 15,000 feet up, you can stare down at subdivisions and tract houses, and America’s class lines will stare right back up at you.

Manhattan, however, is not like most places. Its 1.6 million residents hide in a forest of tall buildings, and even the city’s elite take the subway. Sure, there are obvious brand-name buildings and tony ZIP codes where the price of entry clearly demands a certain amount of wealth, but middle-class neighborhoods do not really exist in Manhattan — probably the only place in the United States where a $5.5 million condo with a teak closet and mother-of-pearl wall tile shares a block with a public housing project.

In TriBeCa, Karen Azeez feels squeezed. A fund-raising consultant, Ms. Azeez has lived in the city for more than 20 years. Her husband, a retired police sergeant, bought their one-bedroom apartment in the low $200,000 range in 1997.

“When we got here, I didn’t feel so out of place, I didn’t have this awareness of being middle class,” she said. But in the last 5 or 10 years an array of high-rises brought “uberwealthy” neighbors, she said, the kind of people who discuss winter trips to St. Barts at the dog run, and buy $700 Moncler ski jackets for their children.

Even the local restaurants give Ms. Azeez the sense that she is now living as an economic minority in her own neighborhood.

“There’s McDonald’s, Mexican and Nobu,” she said, and nothing in between.

In a city like New York, where everything is superlative, who exactly is middle class? What kind of salary are we talking about? Where does a middle-class person live? And could the relentless rise in real estate prices push the middle class to extinction?

“A lot of people are hanging on by the skin of their teeth,” said Cheryl King, an acting coach who lives and works in a combined apartment and performance space that she rents out for screenings, video shoots and workshops to help offset her own high rent.

“My niece just bought a home in Atlanta for $85,000,” she said. “I almost spend that on rent and utilities in a year. To them, making $250,000 a year is wealthy. To us, it’s maybe the upper edge of middle class.”

“It’s horrifying,” she added.

Her horror, of course, is Manhattan’s high cost of living, which has for decades shocked transplants from Kansas and elsewhere, and threatened natives with the specter of an economic apocalypse that will empty the city of all but a few hardy plutocrats.

And yet the middle class stubbornly hangs on, trading economic pain for the emotional gain of hot restaurants, the High Line and the feeling of being in the center of everything. The price tag for life’s basic necessities — everything from milk to haircuts to Lipitor to electricity, and especially housing — is more than twice the national average.

“It’s overwhelmingly housing — that’s the big distortion relative to other places,” said Frank Braconi, the chief economist in the New York City comptroller’s office. “Virtually everything costs more, but not to the degree that housing does.”

The average Manhattan apartment, at $3,973 a month, costs almost $2,800 more than the average rental nationwide. The average sale price of a home in Manhattan last year was $1.46 million, according to a recent Douglas Elliman report, while the average sale price for a new home in the United States was just under $230,000. The middle class makes up a smaller proportion of the population in New York than elsewhere in the nation. New Yorkers also live in a notably unequal place. Household incomes in Manhattan are about as evenly distributed as they are in Bolivia or Sierra Leone — the wealthiest fifth of Manhattanites make 40 times more than the lowest fifth, according to 2010 census data.

Ask people around the country, “Are you middle class?” and the answer is likely to be yes. But ask the same question in Manhattan, and people often pause in confusion, unsure exactly what you mean.

There is no single, formal definition of class status in this country. Statisticians and demographers all use slightly different methods to divvy up the great American whole into quintiles and median ranges. Complicating things, most people like to think of themselves as middle class. It feels good, after all, and more egalitarian than proclaiming yourself to be rich or poor. A $70,000 annual income is middle class for a family of four, according to the median response in a recent Pew Research Center survey, and yet people at a wide range of income levels, including those making less than $30,000 and more than $100,000 a year, said they, too, belonged to the middle.

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