This project unifies a 1940s house with a late-1980s addition to the rear by adding a second story that is open to the original house below. Consistent structure and space allow the house to become less compartmentalized and more efficient. High ceilings and clerestory windows contribute to passive cooling. Inspired by the client’s Asian art and antique collection, the design includes gallery space and a second-floor pedestrian bridge leading to the terraced landscape behind the house.