He co-founded RFR Holding, which owns a portfolio of 93 properties valued over $15.5 billion in cities including New York, Miami, Las Vegas, and Tel Aviv.

[1] Rosen is a noted collector of modern and contemporary art, owning more than 800 postwar pieces, including 100-plus works by Andy Warhol.

[3] His mother, Anni, spent World War II hiding in a Belgian farmhouse, while his father, Isak, was held in concentration camps in Germany and occupied Poland.

In 2006, Rosen partnered with Ian Schrager, a longtime friend and co-founder of Studio 54, to transform the 123-year-old Gramercy Park Hotel with minimalist architect John Pawson.

[5] In 2006, Rosen announced plans to develop the site at 610 Lexington Avenue in NYC (directly behind the Seagram Building) into a glass hotel and condominium tower to be designed by Sir Norman Foster.

[12] The house was designed and built in 1938 by Edward Durell Stone in the International Style for Anson Conger Goodyear, the first president of the Museum of Modern Art.

[15] He keeps many of his important pieces of art there, including The Virgin Mother,[16] a 13-ton, 33-foot-high bronze sculpture by Damien Hirst of a pregnant woman with peeled skin and an exposed fetus.

[18] Rosen holds an annual dinner party at the W South Beach during Art Basel, attended by a mix of celebrities and business leaders.