The Copper (formerly known as American Copper Buildings and 626 First Avenue) is a complex consisting of two luxury residential skyscrapers in the Murray Hill neighborhood of Manhattan in New York City. The buildings were developed by JDS Development and were designed by SHoP Architects with interiors by SHoP and K&Co. The buildings are one of several major collaborations between JDS and SHoP; others include 111 West 57th Street, also in Manhattan, and The Brooklyn Tower in Brooklyn.

The site of the two towers was originally a lot that hosted Consolidated Edison's Kips Bay Generating Station. The developer Sheldon Solow bought the generating station's site and resold a portion of the site to JDS in 2013. JDS built the American Copper Buildings from 2014 to 2016; American Copper West opened in April 2017, and American Copper East opened in late 2018. The facade is clad in copper and glass, and the structures are designed so they appear to bend toward each other. The two towers are connected by a three-story skybridge, which includes some of the buildings' amenity spaces. The buildings are residential and include 761 rental units, 20% of which are affordable.

The site of the two towers was originally a lot that hosted the Consolidated Edison Kips Bay Generating Station. The lot was one of three parcels purchased by Sheldon Solow (along with the former Consolidated Edison Waterside power plant on the east side of First Avenue from 38th to 41st streets) and was planned to be redeveloped as part of a seven-tower, $4 billion complex designed by Skidmore, Owings & Merrill. The SOM plan would also have included a park and a public school, as well as an adjacent public space designed by American architect Richard Meier.

Solow sold the southwest corner of the lot in 2010 to the New York City School Construction Authority for $33.25 million, which was used to build P.S. 281 – The River School. He later sold the remaining plot on 35th Street to JDS and Largo in 2013 for $172 million. JDS and Largo secured a loan from Cornerstone Real Estate Advisors to purchase the land. Following a ULURP, Solow changed his plans to a twin-tower structure, which JDS followed per the zoning, although with a new architect. JDS executives were attracted to the lot in part due to the waterfront location and proximity to the United Nations and Langone Medical Center.

Construction began on the site in mid-2014, and the copper cladding was first applied in mid-2015. The west and east towers topped out in late 2015 and early 2016, respectively, and installation of the skybridge between the two towers began in January 2016. The official name of the towers – The American Copper Buildings – was released in April 2016 as the property launched initial leasing efforts. In December 2016, the project received a $500 million senior mortgage from American International Group along with a $160 million mezzanine loan from Apollo Global Management and SL Green Realty.

The two separate structures opened in phases for renters, with American Copper West opening in April 2017 and American Copper East in late 2018. A cafe called Hole in the Wall opened in the base of the east tower in June 2019.

JDS and Baupost entered into a contract to sell the property to investors Black Spruce Management and Orbach Affordable Housing Solutions in December 2021 for about $850 million. The high price has been interpreted as indicative of broader investor confidence in the recovery of New York City despite the ongoing COVID-19 pandemic. JPMorgan provided $675 million in financing to Black Spruce and Orbach in March 2022.

The north and south elevations of the building's facade are clad in copper, while the east and west elevations are floor to ceiling glass. The two towers are designed such that they appear to "dance" with each other. They are connected by a bridge approximately 300 feet from the ground, three levels in height. The west tower is 540 feet in height, and the east tower is 470 feet tall.