delano alone won the commission for the second-largest residence in the united states, [[oheka castle|oheka]], overlooking [[cold spring harbor, new york|cold spring harbor]] on [[long island, new york]] for financier [[otto kahn]]. built from 1914 to 1919 in french [[chateau]] style, with gardens by [[olmsted brothers]], oheka ranges over 109,000 square feet (10,000 m²) and was staffed with 125 people.