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Current MLS Property Details

1 E Sister Rck Island, Marathon, FL 33050

Marathon, FL, 33050
1 E Sister Rck Island, Marathon, FL 33050
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MLS # A12069701
At a Glance

Property Snapshot

The MLS currently describes this as a 4 bedrooms, 3 bathrooms, 2,304 square feet, built in 2,015.

What Stands Out

Waterfront property
Private pool

About This Property

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.

Property Details

Property Type Single Family Residence
Subdivision Off Shore Island
Development Off Shore Island
County Monroe
Waterfront Yes
Private Pool Yes
Original List Price $16,000,000
MLS ID A12069701
Updated Sep 15, 2026
Quick Payment Estimate

What might this home cost each month?

Starting rate: 6.66% 30 year fixed national average · updated Aug. 27, 2026
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$ /mo
Estimated principal & interest $0/mo
P&I + HOA / condo $0/mo
Taxes, insurance, flood coverage and PMI are not included here. Rate is editable and is not a lender quote.
Listing Office: Compass Florida, LLC • 305-851-2820
Listing Agent: Vladimir Rochebrun • 305-690-5851
MLS ID: A12069701
Property information is displayed from the site's BeachesMLS IDX data feed. Information is subject to change and should be independently verified.
Property Location

Where is this property?

1 E Sister Rck Island, Marathon, FL 33050 · Marathon, FL, 33050
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