The Oosten is a new block-long luxury building in South Williamsburg, Brooklyn, that's designed by acclaimed Dutch architect Piet Boon, along with think! Architecture. The development just unveiled a 5,098-square-foot duplex penthouse designed by Toronto-based boutique design studio Abraham Chan, which features five bedrooms with en-suite baths and stellar views. It also boasts a living room wet bar with custom cabinets and a granite backsplash.