Former Metropolitan Opera mezzo-soprano Nedda Casei has finally found a buyer for the delightfully-fussy Sutton Place co-op she's been trying to bow out of since 2013. First listed for $5.5 million, Casei's wood-ceilinged 17th-floor spread sold to a New Yorker the Observer identifies as Barbara Dau for just $2.9 million. That's nearly half of what Casei wanted for the four-bedroom, four-bath home. Should Dau want to shout for joy over her savings, her neighbors won't hear her: Casei had the home soundproofed. Other amenities include a landscaped and irrigated terrace and views of the East River.