New York's real estate experts have dubbed a lineup of new superluxury skyscrapers overlooking Central Park as Billionaires Row.

One penthouse on the 89th and 90th floors of a skyscraper near Carnegie Hall that went for more than $US100 million ($A139.23 million) seems almost a bargain compared to what will appear next year in a high-rise being built on Central Park South: a 2,136 square metre four-story apartment offered at $US250 million.

That jaw-dropping price was contained in documents the developer filed with the state attorney general’s office with floor plans showing 16 bedrooms, 17 bathrooms, five balconies and a massive terrace.

The multi-million dollar question is: Who can afford to buy these places?

“These are the trophy buildings of our era, and the foreign buyer clearly fuels this very, very high-end condominium tower market,” Brown Harris Stevens real estate broker John Burger said.

The novelty is the prestige of living in sleek, breathtaking skyscrapers with 360-degree views of New York City, thanks to advanced engineering that allows residential buildings to stay skinny while soaring to dizzying heights.