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Gianni Versace-lovers will flip for this over-the-top mansion designed by Lorenzo Carmellini. He’s the Milan-based architect who designed Versace’s boutiques and homes, many with his late partner, architect Rocco Magnoli. Texas-based investor Ken Hill is selling the home, which was his vacation house in the Venetian Isles, for $19.9 million. The mansion, at 921 N....