Marathon Real Estate Search

Marathon Properties over $5,000,000 for Sale

Our website features the best real estate search for available properties over $5,000,000 in Marathon and surrounding areas. It is the only site you will ever need! It is easy-to-use and updated by the official REALTOR®’s database every 15 minutes. 

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Newest Marathon Properties over $5,000,000 for Sale

108 Avenue D, Marathon
$5,499,000
6 Beds ⋅ 6 Baths ⋅ A12088770 MLS ⋅ Coco Plum Beach BLDG.
Experience exceptional waterfront living in this impressive Spanish-inspired concrete residence, built in 2019 and offering approximately 8,107 square feet of construction and 16,500 square feet lot size. Thoughtfully elevated and designed with an emphasis on space, quality, and comfort, this remarkable home showcases a highly customized interior with refined finishes throughout. Solid wood interior doors, generous room proportions, and carefully designed living spaces reflect the attention to detail found throughout the residence. Expansive recreational and entertainment areas on both the first and second floors provide exceptional flexibility for hosting, relaxing, and enjoying everyday family living. The home’s substantial concrete construction and elevated design complement its commanding presence, while the spacious interior offers an ideal combination of elegance and functionality. Positioned along an exceptionally Deepwater, wide-canal home with direct ocean access, the property provides an impressive waterfront setting and a sense of privacy and tranquility. A distinctive luxury residence offering exceptional scale, generous entertainment spaces, and outstanding waterfront appeal. Ideally located near the airport and surrounded by a variety of restaurants, dining options, and everyday conveniences, the home offers an excellent balance of privacy, accessibility, and lifestyle.

108 Avenue D, Marathon
1 E Sister Rck Is, Marathon
$16,000,000
4 Beds ⋅ 3 Baths ⋅ A12069701 MLS ⋅ Off Shore Island BLDG.
Own an entire private island in the Florida Keys, just ¼ mile offshore from Marathon! East Sister Rock Island offers extraordinary privacy surrounded by turquoise waters, yet is only minutes from the mainland. The property encompasses approx. 6.5 acres, including approx. 5.8 acres of surrounding seabed, creating an exceptional marine setting for snorkeling, swimming, kayaking, paddleboarding, fishing and watersports. The beautifully updated 3-bedroom, 2-bath main residence and detached guest house offer over 5,000 total SF of living and entertaining space. Recent renovations include an updated kitchen with gorgeous countertops and modern finishes. A 12-ft-wide wraparound veranda captures panoramic water views, sunrises and spectacular Keys sunsets. Amenities include a waterfront pool and spa, tropical landscaping, outdoor entertaining areas, and a 100-ft deep-water dock. Self-sufficient infrastructure includes solar and wind power, battery storage, backup generator, desalination system and freshwater cistern capacity. Private helipad provides additional access. Seller is open to select Joint Venture opportunities.

1 E Sister Rck Is, Marathon
2405 Coco Plum Dr, Marathon
$27,500,000
9 Beds ⋅ 10 Baths ⋅ A12067078 MLS ⋅ Coco Plum Beach Replat BLDG.
One of the Florida Keys' most significant newly completed trophy estates, now making its market debut fully completed and never occupied. This one-of-a-kind waterfront residence offers 18,736 SF of interior living space and more than 29,000 SF under roof on approximately 1.72 acres with 200 feet of ocean frontage. A property of this scale, quality and waterfront presence has become exceptionally difficult to replicate under today's development environment, making it as irreplaceable as it is exceptional. Designed for the most discerning owners, the estate features 9 bedrooms, 9.5 bathrooms, a detached guest residence, private elevator, 9-car garage, and an extraordinary indoor-outdoor living experience highlighted by a newly completed 100-foot infinity-edge pool, separate beach-entry pool, and expansive waterfront terraces, unveiling an outdoor environment never before presented to the market. Included in the offering is a deeded 60-foot boat slip at a nearby marina, located approximately two minutes from the residence, providing immediate access to world-class boating and fishing. Marathon International Airport is approximately five minutes away, allowing seamless arrival by private aircraft. Contemporary architecture, exceptional craftsmanship, absolute privacy, and one of the most exclusive waterfront settings in the Florida Keys define this truly irreplaceable trophy estate.

2405 Coco Plum Dr, Marathon
108 Sunrise Dr, Marathon
$7,495,000
5 Beds ⋅ 5 Baths ⋅ A12060805 MLS ⋅ Sunrise Isle BLDG.
** Seller Financing Available With 50% Down Subject To Acceptable Terms ** Nestled on the private gated island of Sunrise Isles in Marathon, Florida Keys, this 2019 oceanfront estate redefines luxury living. One of only 20 residences within this secure island enclave, it offers a rare blend of privacy and the serene beauty of the Keys. This 5-bedroom, 4-bathroom residence spans 3,500 square feet of crafted living space designed to capture breathtaking ocean views. The open-concept single-level floor plan connects gourmet kitchen, dining, and living areas, while floor-to-ceiling windows flood the home with natural light. Each bedroom features an en-suite bathroom, while the primary suite offers panoramic ocean views and a spa-inspired bath. Impact-resistant sliding glass doors open to approximately 700 square feet of covered terrace for exceptional indoor-outdoor living. Set on over 32,000 square feet of waterfront property, the estate boasts 110 feet of sandy beachfront plus 110 feet of protected canal dockage with two custom boat lifts and an L-shaped synthetic dock, providing effortless open-water access. Outdoor amenities include a resort-style pool with water features, creating the perfect island retreat for entertaining or relaxing. Just ½ mile from Sombrero Beach and minutes from shopping, dining, and Marathon Airport, this extraordinary Sunrise Isles estate presents a rare opportunity to own one of the Florida Keys' finest luxury oceanfront residences.

108 Sunrise Dr, Marathon
128 Sunrise Drive, Marathon
$7,750,000
4 Beds ⋅ 5 Baths ⋅ A12028272 MLS ⋅ Sunrise Isle BLDG.
Experience the rare combination of protected dockage and direct oceanfront living at 128 Sunrise Drive. Situated within an exclusive gated enclave of just 20 lots, this newly constructed 2025 waterfront residence offers a level of privacy, luxury, and lifestyle rarely found in the Florida Keys. Positioned to capture unobstructed ocean views and a year-round ocean breeze, this home offers an elevated coastal lifestyle with exceptional attention to detail throughout. Each bedroom features a private ensuite bathroom and spacious walk-in closet, while a true foyer entry, elevator, and abundant storage create a floor plan that is as functional as it is beautiful. The open concept living offers the perfect home to entertain and enjoy tons of natural light. The interior design offers high end tile selections, designer light fixtures and wood accents throughout. The home also features 3 interior bars and window treatments throughout. The living spaces seamlessly transition outdoors, where an expansive entertainment area is designed to embrace the Keys lifestyle. Enjoy a resort-style pool and hot tub, outdoor kitchen, and multiple spaces to relax while overlooking the waters of the Atlantic. A rare wade-in beach offers effortless access to the ocean, while protected dockage on the canal side provides a secure spot for your boat. Additional features include a one-car garage, oversized air-conditioned storage space, and a generous covered carport ideal for vehicles, boats, and more!

128 Sunrise Drive, Marathon
57783 Morton Street, Marathon
$25,000,000
10 Beds ⋅ 13 Baths ⋅ A11977067 MLS ⋅ Crains Subd BLDG.
A Private Waterfront Estate at The Edge of the Gulf of America. Set on 3 secluded acres+/- along one of the most protected stretches of the Gulf of America, 57783 Morton Street is a newly completed estate of rare scale, privacy, and modern coastal design. Surrounded by water, sandscape, and tidal ponds alive with marine life, the property offers more than 200’+/- of direct water frontage and uninterrupted views across the open Gulf. Completed in 2025 by builder and developer Alderuccio Corporation, this resilient, elevated retreat is constructed entirely of concrete and impact glass and is designed for effortless indoor–outdoor living. With three distinct finished living spaces totaling approximately 10,000 SF+/-, the estate functions as a private resort offering privacy, recreation, and exceptional access to the best of the Florida Keys.

57783 Morton Street, Marathon
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