Own an entire private island in the heart of the Florida Keys. Located just ¼ mile offshore from Marathon, East Sister Rock Island offers extraordinary privacy surrounded by turquoise waters, yet remains only minutes from the mainland. The property encompasses approximately 6.5 acres, including approximately 5.8 acres of surrounding seabed that create an exceptional marine setting for snorkeling, swimming, kayaking, paddle boarding, fishing and exploring the crystal-clear waters of the Keys. At the center of the island is a beautifully updated 3-bedroom, 2-bath main residence with a detached guest house, offering over 5,000 total SF of living and entertaining space. Recent interior renovations include a beautifully updated kitchen with gorgeous countertops and modern finishes. A 12-foot-wide wraparound veranda captures panoramic water views, Atlantic sunrises and spectacular Florida Keys sunsets. Designed for the ultimate island lifestyle, the property features a waterfront pool and spa, tropical landscaping, multiple outdoor lounging and dining areas, and a 100-foot deep-water dock with ample dockage. World-class fishing, diving, snorkeling, boating and water-sports begin just outside your door. East Sister Rock is equipped for self-sufficient island living with solar and wind power, battery storage, backup generator, desalination system and substantial freshwater cistern capacity. A private helipad provides an additional point of access. Few properties offer this combination of privacy, accessibility, marine surroundings and established island infrastructure. Seller is also open to exploring select Joint Venture opportunities. Note the sale includes 99 E Ocean Drive on the mainland which has a private dock space.