12399 Overseas Highway # 10 An exceptional opportunity to own a proven income-producing waterfront property in the heart of the Florida Keys! Located in the desirable Coral Lagoon Resort in Marathon, this 3-bedroom, 2.5-bath end-unit townhome offers the perfect combination of investment potential and personal enjoyment. Nightly rentals are permitted, and the property features a well-established vacation rental business with a documented history of gross rental income. Financial records available upon request. Enjoy the advantage of purchasing an established income-producing property while reserving time for your own Florida Keys getaway! Offering 1, 360 square feet of living space, this two-story townhome features an open-concept living and dining area, kitchen with granite countertops, and covered outdoor living spaces overlooking the water. Upstairs, the spacious primary suite opens to a generous private balcony. Boaters will appreciate the included 40-foot deeded boat slip #13 located directly outside the back door! Enjoy quick access to the Atlantic Ocean, Gulf, reefs, sandbars, and world-class fishing. Coral Lagoon features lush tropical landscaping, a heated resort-style pool, and convenient access to the adjacent Boat House Marina with fuel, boat ramp, and boating services. Recent improvements include a new HVAC system and washer/dryer in spring 2026, professionally cleaned dryer vents in summer 2026, and replacement oven and dishwasher within the past three years. Metal roof! Conveniently located near Marathon's restaurants, shopping, and attractions. Whether you're seeking an established vacation rental investment, personal waterfront retreat, or both, this property offers the Florida Keys lifestyle with a proven rental history!