Casino mogul and hotelier Steve Wynn has closed on his 5,600-square-foot duplex at the Plaza. The asking price was $24 million, and a source says Wynn closed at something near that number — a price that includes all the furniture, so no major renovation work is expected. The place was recently refashioned by architect Gal Nauer with wenge wood floors, a “spa gallery,” and a “cloistered exercise room” (whatever that means). A 22-foot-wide terrace off the gallery hall offers park views, which are also available from the living and dining rooms. There’s also another rare terrace off the master bedroom. Most importantly, the massive apartment has plenty of wall space for Wynn’s spectacular art collection — which now (and probably forever) includes Picasso’s 1932 portrait, “Le Rêve,” the painting Wynn famously elbowed in 2006.