The 10 most expensive streets in the world, ranked

Number of ultra-prime sales ($25 million or above): 10

Average ultra-prime sale: $34.5 million

Number of ultra-prime sales ($25 million or above): 10

Average ultra-prime sale: $43.4 million

Number of ultra-prime sales ($25 million or above): 10

Average ultra-prime sale: $49.2 million

Number of ultra-prime sales ($25 million or above): 10

Average ultra-prime sale: $55.7 million

Number of ultra-prime sales ($25 million or above): 10

Average ultra-prime sale: $64.8 million

Number of ultra-prime sales ($25 million or above): 13

Average ultra-prime sale: $45.5 million

Number of ultra-prime sales ($25 million or above): 20

Average ultra-prime sale: $43 million

Number of ultra-prime sales ($25 million or above): 32

Average ultra-prime sale: $44.9 million

Central Park South, which is the portion of 59th Street that stretches from Columbus Circle to Fifth Avenue along Central Park, is the most expensive street in New York by median sale price, as Business Insider's Libertina Brandt recently reported.

It had a median sale price of $9.8 million from January through July 2019.

The street is home to 220 Central Park South, the Robert A.M. Stern-designed luxury tower where Ken Griffin bought a $238 penthouse in January 2019, shattering the record for the most expensive home sale in the US.

Many of the major sales of the past five years have been in 220 Central Park South.

In December 2019, billionaire hedge-fund executive Daniel Och closed on a $95 million penthouse in the building. Singer Sting and wife Trudie Styler paid $67.5 million for a penthouse in July 2019, Curbed New York reported. And in January 2019, Brazilian construction heiress Renata de Camargo Nascimento bought a unit for about $30 million.

Number of ultra-prime sales ($25 million or above): 35

Average ultra-prime sale: $81.8 million

Mount Nicholson Road is in the Peak, Hong Kong's most exclusive neighborhood that overlooks the city and is home to bankers, expatriates, business magnates, celebrities, and millionaires and billionaires.

David Ji, the head of research and consultancy, Great China, at Knight Frank, said in the report that luxury real-estate prices on Mount Nicholson are much more stable than mass market prices, which can fluctuate with economic conditions.

"It seems clear that there is healthy appetite from super luxury buyers if their desired price level is reached," Ji said.

Number of ultra-prime sales ($25 million or above): 41

Average ultra-prime sale: $38.5 million

"As the leading ultra-prime location in the world, 57th Street is home to the most extraordinary residential offerings," Susan de França, president and CEO at Douglas Elliman Development Marketing, said in the report.

One of the glossy new skyscrapers on 57th Street is 111 West 57th Street, also known as Steinway Tower. The 1,428-foot building is the world's skinniest skyscraper by height-to-width ratio. The tower is 24 times taller than it is wide and has only one residence per floor.

Michael Dell, the founder and CEO of Dell Technologies, paid about $100 million for a penthouse in Steinway Tower in 2014. It was the most expensive sale in the US at the time.

Also on 57th Street is Central Park Tower, which recently became the tallest residential building in the world at 1,550 feet.