After giving his children the experience of living in London for two years, Warner Music boss and Seagrams heir Edgar Bronfman Jr. and his family have skipped back across the pond. The gang, which has bought and sold nearly $150 million in real estate over the past ten years, is buying a 6,500-square-foot triplex penthouse at 812 Fifth Avenue. It was most recently listed at $15.9 million. [NYO]