Actor Leonardo DiCaprio recently purchased a unit at the David Rockwell-designed Riverhouse building in Battery Park City. The building is designed to be ecologically friendly while still luxurious. Details about the film star's specific residence weren't disclosed, but the Riverhouse has 264 units, including three bedroom duplexes that are still available. DiCaprio is well known for his eco-consciousness and speaks out on pro-environmental issues frequently. Riverhouse has its own water treatment and air filtration systems,......