One57 – Manhattan, New York

One57, formerly known as Carnegie 57, (nicknamed "The Billionaire Building") is a 75-story (marketed as 90-story) supertall skyscraper at 157

West 57th Street in the Midtown neighborhood of Manhattan, New York City. Upon completion in 2014, it stood at 1,005 feet (306 m) tall, making it the tallest residential building in the city for a few months until 432 Park Avenue was constructed. The building has 92 condominium units on top of a new Park Hyatt Hotel with 210 rooms, which is set to become the flagship Hyatt property.

The contractor is Lend Lease Project Management & Construction, and the developer is Extell Development Company. As of January 2015, it is home to the most expensive residence ever sold in New York City.

Extell Development Company’s founder and President, Gary Barnett, spent 15 years assembling the property and air rights on 57th Street. At first, he said he wanted to build a 300,000 square-foot building, but plans for views of the park took shape as the assemblage got larger and markets started rising to new levels.Foundation work started in January 2010.

In May 2012, it was announced a buyer had agreed to pay a record price in New York of more than $90 million for the 10,923-square-foot duplex penthouse on the 89th and 90th floors. Just two months later, the Prime Minister of Qatar, Sheikh Hamad bin Jassim bin Jaber Al Thani, broke that record by agreeing to purchase a penthouse unit for $100 million.

After the sales offices had been open for six months, Extell announced One57 was 50% sold with $1 billion in transactions.

On June 20, 2012, it was announced that framework for the top floor had been completed. Shortly after, it was revealed the 13,550-square-foot “Winter Garden” duplex penthouse, located on the 75th and 76th floors, had gone into contract for an undisclosed amount.

In October 2012, entrepreneur Michael Hirtenstein and One57 developer Gary Barnett had a public clash regarding a unit Hirtenstein agreed to purchase in the building. Hirtenstein claimed he would not spend $16 million for a unit without seeing it, and that the view from the unit he purchased was obstructed. Barnett has been strict about not permitting buyers to view apartments prior to purchase, and as Hirtenstein paid a construction worker to show him his unit, Barnett refunded Hirtenstein's funds and canceled the contract.

On October 29, 2012, during Hurricane Sandy, the construction crane on the building partially collapsed, causing thousands of residents and hotel guests in the neighborhood to be evacuated for six days. By November 5, the crane was secured and through traffic in the surrounding area was allowed.

In response to the crane collapse, a class action lawsuit was filed by dentists in the surrounding area, complaining that the incident caused them to evacuate their offices, with subsequent loss of income. The New York City Department of Buildings also stated they had received multiple complaints about the work site. However, the crane was inspected a week earlier and considered in good shape. City officials called the failure of the boom a freakish occurrence.

In May 2013, Extell announced plans to hoist a new crane on May 10–11. The plans endorsed by the New York City Buildings Department involved a mandatory evacuation of the neighboring Alwyn Court as well as the Briarcliff Apartment Building during the process. The residents of the building would each receive up to $1,500. The coop board at Alwyn Court announced that it would seek a court order against the forced evacuation, saying the Department of Buildings appeared to be "an arm of the developer." The crane was hoisted on May 11 as planned after Extell and Alwyn signed an undisclosed agreement. Its tasks completed, the replacement crane was removed on November 11, 2013. 

The tower is designed by Pritzker Prize-winning French architect Christian de Portzamparc. The interiors are by New York-based designer Thomas Juul-Hansen.

The use of dark and light glass on the building’s exterior creates vertical stripes, while also manipulating sunlight and maximizing views. The tower is characterized by its rippled canopies and numerous setbacks on 57th Street, its mottled fenestration, curved tops, scoops and accentuated verticality.

One57 was named "Worst Building of the Year" in 2014 by Curbed.com: "Pretty much everyone (or at least most archicritics) agrees that its wavy blue facade is ugly. Justin Davidson of New York magazine called it 'clumsily gaudy.' James Russell, formerly of Bloomberg ... lamented the 'endless acres of cheap-looking frameless glass in cartoonish stripes and blotches of silver and pewter.' Michael Kimmelman of the Times had similarly harsh words: "[The building] unravels as a cascade of clunky curves ... chintzily embellished, clad in acres of eye-shadow-blue glass offset by a pox of tinted panes, like age spots.'"