Aby J. Rosen (born May 16, 1960) is a German-born American real estate tycoon living in New York City. He is the co-founder of RFR Holding, which owns a portfolio of 71 properties in United States cities including New York, Miami, and Las Vegas; and Tel Aviv, Israel. Highlights include the Seagram Building, Lever House, W South Beach, W Tel Aviv, Gramercy Park Hotel, Paramount Hotel, and Miracle Mile Shops at Planet Hollywood Resort & Casino, among other properties. Rosen is also a member of, a founding investor in, and the landlord to the Core Club in New York.
Rosen is a noted collector of modern and contemporary art, owning more than 800 postwar pieces, including 100-plus works by Andy Warhol. His collection includes pieces by Jean-Michel Basquiat, Alexander Calder, Damien Hirst, Richard Prince and Jeff Koons.
