A $10 million private island retreat in South Carolina is listed.

For $10 million, a vast southern estate situated on a private island in South Carolina is up for grabs.

The 56.1-acre site, known as Pine Island, is divided into two parcels: the east has a major residence spanning more than 6,000 square feet and was developed by renowned sustainable developer and architect William McDonough.

According to the listing with Jack Huguley of Daniel Ravenel Sotheby’s International Realty, the house features top-notch materials with Japanese-inspired design details, such as recycled red western cedar, white oak, hand-forged railings, soapstone fireplaces, a copper roof, ancient cypress logs, and specially made bronze hardware.

According to listing images, the bright three-bedroom, three-and-a-half-bathroom home has a lot of skylights, floor to ceiling windows, and sliding doors throughout. Most of the bedrooms and living areas open directly out onto the wraparound deck. The main suite features a bedroom that opens onto the pool area and terrace in the backyard, which is shaded by trees, and a bathroom with two sinks, a soaking tub, and a steam shower.

Warm wood-paneled interiors are incorporated throughout the home, including in an expansive living room with vaulted ceilings and a fireplace, a spacious open kitchen, and a formal dining room with high ceilings, a fireplace, and doors that open out onto the deck, per listing photos.

The east parcel also features landscaping by Washington D.C.-based firm Oehme, Van Sweden and Associates; tennis courts; a six-car garage; an 885-square-foot guest cottage; a barn; and a fenced paddock that sits adjacent to a potential horse pasture. A deepwater dock on Chechessee Creek is situated a short walk from the house, with a dock complex that includes a covered pavilion with electricity and water, a 60-foot main dock with an extension for the owner’s seaplane and a kayak dock, as well as a boat lift and mooring buoy.

“The $10 million asking price was identified as a sweet spot for luxury buyers who could appreciate the expansiveness and privacy of purchasing a 56-acre island and its accessibility to Spring Island lifestyle amenities,” Mr. Huguley told Mansion Global. “It’s a very rare combination.”

Staffing on Pine Island currently includes four full-time as well as two part-time employees, and the property’s current caretakers are available and interested in providing continued services for the new owner, according to marketing materials. The current owners, who acquired the property for $2.8 million in 1995, records show, were not immediately available for comment.

Though less developed, the west portion of the island has plans for four distinct 5- to 6-acre housing plots, a pier, and docks to accommodate four boats. Marketing materials state that government approvals will be required if a buyer decides to develop the four home sites, and that the current owner must continue to pay Property Owners Association fees for each of the four sites in addition to the fees for the home on the east parcel in order to maintain the right to subdivide the parcel into four home sites.

“While we may attract some investor-buyers, we will not be surprised if our eventual buyer is one interested in enjoying the privacy and control of the entire island ” Mr. Huguley said. “Some may be interested in building a new larger main house on the western side of the island. This would make for an enviable family compound—acreage, seclusion, privacy, high-end living spaces, paddocks, caretakers cottage.”

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