The copper-clad pyramid roof atop the Crown Building has graced the corner of Fifth Avenue and 57th Street since 1921. Almost a century later, the ornate edifice has been reborn as Aman New York Residences, a bespoke addition to Billionaires’ Row. Owners of the twenty upper-floor condos may indulge in the services of the in-house hotel, which include a pool-equipped spa, a subterranean jazz club, ...