The original house (left) only gave two glimpses of the vast Pacific Ocean out of the west-facing windows—an unusual choice given the epic sweep and clear cachet of an uninterrupted ocean view. Aidlin Darling Design took a different tack with the new addition (right), using the cypress trees as a natural screen to shield the lower levels while opening the third floor to stunning views. The Cor-Ten steel cladding on the new house is designed to further redden and rust with the help of the obliging sea air.