At the end of 2020, billionaire Israel Englander's hedge fund Millennium Management, LLC will leave in the building to move to nearby 399 Park Avenue. In 2018, investment bank William Blair & Company also announced plans to leave the building for in 1166 Avenue of the Americas. In February 2019 ING Bank loaned Brookfield Properties $750 million to pay for renovations on the property. Apollo Global Management also reportedly provided a $300 million mezzanine loan, bringing the total financing to over $1 billion. In April 2019, Vornado sold a 48% stake in a portfolio of their retail properties, including the retail condominium at 666 Fifth Avenue, to the Qatar Investment Authority and Crown Acquisitions in a deal that valued the entire portfolio at $5.6 billion.