Premier Brokers International
1 E Sister Rck Island, Marathon, FL 33050
ActiveMLS listing sourceMIAMI REALTORS® MLS
ActiveMLS® A12069701
$16,000,000

1 E Sister Rck Island, Marathon, FL 33050

Beds
4
Baths
3
Sqft
2,304
Est. payment$93,144/mo
Home type
Single Family Residence
Year built
2015
Lot size
280,526 sqft
Price / sqft
$6,944
HOA
$0/mo
Community
Off Shore Island

Property description

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.

Listing activity

Days on market
34
Listed
Aug 12, 2026
MLS listing updated
Sep 15, 2026
Feed last checked
10 minutes ago

Listed by Vladimir Rochebrun · Compass Florida, LLC

Map

Map location is based on MLS-supplied coordinates. Verify the location before relying on it.

Facts & features

Interior

Bedrooms & bathrooms

Bedrooms
4
Bathrooms
3
Bathrooms (decimal)
3
Full bathrooms
3
Half bathrooms
0

Rooms & features

Rooms
1
Interior features
Bedroom Layout - Three Way Split, Built-in Features, Closet Cabinetry
Flooring
Tile, Other
Appliances
Dishwasher, Dryer, Electric Range, Microwave, Oven, Refrigerator, Solar Hot Water, Trash Compactor, Washer, Other
Fireplace
Yes
Other equipment
Satellite Dish, Other

Heating & cooling

Heating
Solar
Cooling
Central Air
Property

Parking

Garage spaces
0
Carport spaces
0
Covered spaces
0

Exterior

Stories
1
Building area
5,760 sqft
Entry level
1
Patio & porch
Porch - Wrap Around, Porch - Open, Porch, Deck
Exterior features
Lighting
Pool
Yes
Pool features
In Ground
View
Ocean, Direct Ocean
Waterfront
No Fixed Bridge, Ocean Access, Navigable Water, Ocean
Waterfront property
Yes

Lot

Lot size
280,526 sqft
Lot size (acres)
6.44 acres
Lot features
Fruit Tree(s)
Zoning
0S
Construction

Type & style

Home type
Single Family Residence
Year built
2015

Materials

Construction
Block
Roof
Metal
Levels
One
Faces
East
Utilities & green energy

Utilities

Sewer
Septic Tank
Water
Other
Community & HOA

Community

Subdivision
Off Shore Island
MLS area
2980
MLS subarea
Other
55+ community
No

Association

Has association
No
Estimated monthly dues
$0
Amenities
Boating
Lease details

Not reported by the listing source.

Location

Area details

City
Marathon
County
Monroe
ZIP code
33050
Manufactured home details

Not reported by the listing source.

Financial & listing details

Listing

MLS number
A12069701
Possession
Negotiable
Original list price
$16,000,000
Parcel number
00105590000000
Annual property tax
$25,482
Tax year
2025
Tax legal description
23 66 32 LOT 2 (US PATENT 1186533) EAST SISTER ROCK AND ADJACENT BAY BOTTOM G71-513(II DEED 20369) OR374-139/40 OR752-1640 OR752-1642 OR755-
Additional MLS details

Reported by the listing source

Association Amenities
Boating
Association
No
Bathrooms Total Decimal
3
Bathrooms Total Integer
3
Building Area Total
5760
Construction Materials
Block
County Or Parish
Monroe
Days On Market
34
Direction Faces
East
List Price
16000000
Living Area
2304
Lot Size Acres
6.44
Lot Size Area
280628
MLSArea Major
2980
MLSArea Minor
Other
Mls Status
Active
On Market Date
2026-08-12
Patio And Porch Features
Porch - Wrap Around, Porch - Open, Porch, Deck
Postal Code
33050
Property Sub Type
Single Family Residence
Property Type
Residential
Rooms Total
1
Senior Community
No
Standard Status
Active
State Or Province
FL
Status Change Timestamp
2026-08-12T04:00:00Z
Stories Total
1
Subdivision Name
Off Shore Island
Water Source
Other
Waterfront Features
No Fixed Bridge, Ocean Access, Navigable Water, Ocean
Tax Annual Amount
25482
Bathrooms Full
3
Pool Private
Yes
Bedrooms Total
4
Bathrooms Half
0

Market value

Automated estimate—No licensed valuation source connected
Estimated sales range—Ask Karim for a local market analysis
Estimated rent—No licensed rental valuation source connected

Price history

DateEventPrice
Aug 12, 2026ListedMIAMI REALTORS® MLS$16,000,000$6,944/sqft

Public tax history

YearProperty taxesAssessment
2025$25,482—

Payment calculator

Estimated monthly payment$93,144/moIllustrative estimate, not a loan offer.
Principal & interest
$83,021
Property taxes
$2,124
Insurance
$8,000
Association dues
$0

Live national rate context is displayed below through Mortgage News Daily’s official widget. The calculator rate remains a separate assumption until licensed machine-readable access is connected. This is not a loan offer.

Neighborhood

Area

Off Shore Island

Marathon · Monroe County · 33050

Climate risk

—

No licensed climate-risk source is connected.

Nearby schools

Not reported by the listing source.

School names and districts are MLS-reported when available. Verify attendance boundaries with the school district. Ratings require a licensed ratings provider.

Nearby homes

12 homes

Similar homes

5 homes
MLS listing source

MIAMI REALTORS® MLS · Listing courtesy of Compass Florida, LLC. All listings featuring the BMLS logo are provided by BeachesMLS, Inc. This information is not verified for authenticity or accuracy and is not guaranteed. Copyright ©2026 BeachesMLS, Inc. IDX information is provided exclusively for consumers’ personal, non-commercial use and may be used only to identify prospective properties they may be interested in purchasing or leasing. Terms of use · Equal Housing Opportunity.