H
yannis Port’s waterfront estate, now listed for $21.5 million, is the priciest property on Cape Cod. The 13‑bedroom, 12‑bath complex sits on three acres and includes a main house and a guesthouse at 151 and 155 Irving Ave. Built in 1914, the white mansion overlooks Hyannis Harbor and is often confused with the nearby Kennedy Compound; historic photos show the Kennedys sailing in front of it. The Olmsted Brothers designed the private beach and surrounding landscaping.

    Agent Paul Grover describes the drive as “stately” and the interior as “dramatic,” with panoramic views of Nantucket Sound, Hyannis Port Harbor, and Great Island. The main house features a primary suite, six guest rooms, a pool, and a waterside terrace, while the guesthouse offers a separate kitchen, four bedrooms, and two private apartments. The estate has been owned by the same family for 25 years, last sold for $6 million in 2000, and has seen recent upgrades to its seawall, pool, and windows.

    Located just steps from the West Beach Club and Hyannis Port Yacht Club, the property is minutes from Cape Cod Gateway Airport and ferry service to Martha’s Vineyard and Nantucket. Its blue‑trim details and classic molding give it a patriotic, Fourth‑of‑July vibe that Grover says feels “like a real slice of Americana.”