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The living-room alcove (formerly a kitchen space on the second floor) now has Venetian-glass mirrors and a gold-leaf ceiling. “My only requirement was that it be comfortable,” says Gambaccini. “I even thought it could be a giant bed.” Designer Roberto Gerosa and architect Stephan Jaklitsch, the man behind the Marc Jacobs stores, made the basement into a new kitchen.

PHOTOGRAPHS BY FRANÇOIS DISCHINGER