305-609-4190
1 E Sister Rck Is, Marathon FL 33050
Active Single Family Residence Waterfront

1 E Sister Rck Is, Marathon FL 33050

Marathon, FL, 33050

$16,000,000

Est. $80,905/mo (20% down)

4
Beds
3
Baths
2,304
Sq Ft
2015
Year Built
Lot Sq Ft
Garage

Photo Gallery (25 photos)

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

MLS #

A12069701

Status

Active

Property Type

Residential

Sub Type

Single Family Residence

Year Built

2015

Pool

No

Waterfront

Yes

Price / Sq Ft

$6,944

HOA Fee

None

Est. Insurance

$5,333/mo

Tax Year

2025

Tax Amount

$25,482

Garage

Lot Size

MLS Area

Off Shore Island

Subdivision

Off Shore Island

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Flood Zone & Insurance

Flood zone data not available for this listing. Check FEMA directly

Investment Analysis

$112,000
Est. Monthly Rent
1.6%
Cap Rate
8.1%
Cash-on-Cash
$258,180
Net Operating Income

ROI Projections (4% Annual Appreciation)

149%
5-Year ROI
Value: $19,466,446
321%
10-Year ROI
Value: $23,683,909
521%
15-Year ROI
Value: $28,815,096

Estimates based on area averages. Actual returns may vary. Consult a financial advisor.

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