520 Park Avenue is a skyscraper on East 60th Street near Park Avenue on the Upper East Side of Manhattan, New York City. It was designed by Robert A.M. Stern Architects and completed in 2018. The building was funded through a US$450 million construction loan from The Children's Investment Fund. At 781 feet tall, it is the 36th tallest building in New York City and the tallest on the Upper East Side. Arthur and William Lie Zeckendorf of Zeckendorf Development developed the building.