Exclusive | Billionaires Row developer calls his luxury supertall a financial disaster weeks after its trophy penthouse was discreetly delisted

The developer behind one of Manhattan’s most recognizable skyscrapers has delivered a surprisingly blunt verdict on the project that helped redefine Billionaires’ Row.Kevin Maloney, founder of Property Markets Group and co-developer of the ultra-slender 111 W.57th St., praised the tower’s striking design while acknowledging the financial pain it caused.“From an architectural point of view, it’s a marvel,” Maloney said Tuesday during a panel discussion at the National Association of Real Estate Editors conference in Miami.Then, he admitted: “Financially, it was a disaster.”The candid assessment came just weeks after the building’s crown jewel, a four-story penthouse that once carried a massive $110 million asking price, quietly disappeared from the market.The residence, known as Quadplex 80, occupies the tower’s top four floors and was unveiled last year as New York City’s most expensive publicly listed home — at a price that has since been surpassed.

The sprawling aerie stretches across more than 11,400 square feet, with private terraces, a dedicated elevator, a spiral staircase and sweeping views that span Central Park, both rivers and the Manhattan skyline.The trophy listing was later reduced to $98 million.Last month it was removed from public marketing altogether, according to its StreetEasy history.It is unclear if or when it will resurface on the market.

The Post has reached out for comment. For Maloney, the roller-coaster journey has been more than a decade in the making.“We recently completed, and not really too successfully, this tiny tower in Manhattan,” he told attendees.“That project took us about 11 years.”The development, launched in partnership with Michael Stern’s JDS Development Group, began construction in 2013 at the height of New York’s super-luxury condominium boom.

But the project encountered turbulence long before residents moved in.Sales were originally expected to launch in 2016, but a cooling luxury m...