One of the last sponsor units at One57 just hit the market asking $29M

Ryan Serhant is marketing the 5,129-square-foot apartment

One57 and Ryan Serhant
One57 and Ryan Serhant

A duplex condominium at One57 is for sale for the first time ever, with a $28.5 million price tag.

Nest Seekers International’s Ryan Serhant is marketing the property, dubbed “Spring Garden Residence.”

The 5,129-square-foot apartment, designed by Katherine Newman Design, is one of the last units at the tower to hit the market, and was only recently completed. It includes five bedrooms, 5.5 bathrooms and a 17- by 28-foot solarium with Central Park views. Its largest room is 43 feet long.

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The unit, which sits on the 41st and 42nd floors, initially had a price tag of $16.75 million in the tower’s 2012 condo offering plan.

Extell Development completed the 1,005-foot-tall condo and hotel tower at 157 West 57th Street in 2014 and the first apartment sales closed that year. In December 2014 a penthouse at the tower sold for $100.5 million — to this day the most expensive apartment in New York’s history. The Wall Street Journal recently revealed that Michael Dell was the buyer.

Several units at the tower have recently re-sold for substantial losses, amid a dip in the luxury condo market.

Serhant, a star of the Bravo TV series “Million Dollar Listing New York,” recently bought author Jonathan Safran Foer’s Boerum Hill townhouse for $7.6 million.