Oheka by RD Riccoboni. Summer days at the grand estate on Long Island New York. Oheka Castle, also known as the Otto Kahn Estate, a gilded age mansion, is located on the North Shore of Long Island, in the West Hills section of Huntington, NY. It was the country home of investment financier and philanthropist Otto Hermann Kahn and his family. The name Oheka is a portmanteau of its original owner's name Otto Hermann Kahn, which Kahn also used to name his yacht Oheka II and his ocean-front Villa Oheka in Palm Beach, Florida. The mansion was built by Kahn between 1914 and 1919, and is the second largest private home in the United States, comprising 127 rooms. Today, the castle is a historic hotel, with 32 guest rooms and suites, and is a popular wedding venue for socialites, celebrities, and dignitaries, as well as the backdrop to many photo shoots, television series and Hollywood films. The estate also offers tours of the estate and gardens.