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…