From its rooftop garden feasting on Chicago’s towering skyscrapers to the multistoried winding staircase at its heart, the Gold Coast mansion dazzles. Created in 1920, it glows today as it did then. The exquisitely updated 7,200-square-foot haven begins with two gracious foyers and the skylit staircase and elevator. From here, a two-story living room ushers in sunlight through nine cathedral windows, joined by an open dining room and kitchen by de Giulio. Other delights are a library, entertainment lounge, two family rooms, and a wine cellar. The master suite, one of four bedrooms excluding an apartment, lends serenity in a private oasis of calm.