13 Riverside Avenue, Mastic Beach, NY 11951

• 3 beds |
• 3 baths |
• 2,340 sqft

Property Description

Waterfront living with endless potential on Poospatuck Creek, offering direct access to the Forge River and beyond. This split-level home is all about location, views, and opportunity. The upper level features an open floor plan designed to capture the water from every angle, with three sliding glass doors that open to a sprawling upper deck, perfect for entertaining, relaxing, and soaking in the scenery. Enjoy 100 feet of bulkhead and your own private dock, ideal for boating, kayaking, paddle boarding, or simply enjoying life on the water. Wake up to stunning sunrises and wind down with peaceful sunsets reflected across the creek. This setting delivers true waterfront serenity. The home offers two additional rooms with flexible use, ideal for a home office, gym, game room, or creative space. Buyers may also choose to add wardrobes to use these rooms as additional sleeping areas. The lower level includes exterior entrances, creating excellent potential for a guest suite or accessory apartment with proper permits. Whether you envision multigenerational living, rental income, or flexible work-from-home space, the layout supports a variety of possibilities This home offers a fantastic opportunity for buyers ready to bring their vision and create a custom waterfront retreat tailored to their style. With an unbeatable waterfront setting, this is a rare chance to own property with direct access to the Forge River and the Great South Bay.

Listing Status:

Active

Data Last Updated:

February 8, 2026 at 7:20AM

Listing Office:

EXP Realty : 888-276-0630

MLS ID:

955402

Interior

• General: First Floor BedroomFirst Floor Full BathEat-in KitchenOpen FloorplanPrimary BathroomWasher/Dryer Hookup
• Appliances: Gas Oven
• A/C: Wall/Window Unit(s)
• Heating: BaseboardHot WaterOil

Exterior

• Style: Split Level
• Parking: DrivewayGarage

Location

• Originating MLS: onekey2
• School District: William Floyd
• County: Suffolk County

Lot

• Zoning: 0200-940-00-05-00-029-000
• View: Water
• Fencing: Back YardFencedVinyl

Utilities

• Utilities: Cable AvailableElectricity ConnectedPropaneTrash Collection PublicWater Connected
• Water: Public
• Sewer: Cesspool

Financial

• Source: onekey2