Recently Listed Open House 1/31 11am - 1pm
13 Riverside Avenue
Mastic Beach, NY, 11951 $ 549,000
Bedrooms3 Baths3.0 Sq 2,340 Monthly Estimate*
$ 3,380
for $549,000 with 3 bedrooms and 3 full baths. This 2,340 square foot home was built in 1972 on a lot size of 0.25.
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.
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Open House
1/31/2026 11:00 AM - 1:00 PM
13 Riverside Avenue Mastic Beach, NY
* Some states or local ordinances may prohibit Open Houses at this time, please confirm with your Weichert agent or local rep to confirm
FeaturesInteriorInterior Amenities First Floor Bedroom First Floor Full Bath Eat-in Kitchen Open Floorplan Primary Bathroom Washer/Dryer Hookup
Basement (Y/N) N
Fireplace Y/N N
Half Baths 0
Total Bedrooms 3
Total Baths 3
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GeneralSewer Cesspool
Heating Baseboard Hot Water Oil
Cooling Wall/Window Unit(s)
Utilities Cable Available Electricity Connected Propane Trash Collection Public Water Connected
Appliances Gas Oven
Garage Spaces 1
Architectural Style Split Level
Construction Materials Vinyl Siding
Year Built 1972
View Water
Property Subtype Single Family Residence
Tax Year 2025
Parcel Number 0200-940-00-05-00-029-000
Waterfront Features Bulkhead Creek River Access Water Access Waterfront
County Suffolk County
Property Type Residential
HOA N
Garage Y/N Y
Total Rooms 10
Full Baths 3
High School William Floyd High School
City Brookhaven
Senior Community Y/N N
High School District William Floyd
Carport Y/N N
Elementary School Tangier Smith Elementary School
Property Attached Y/N N
Tax Annual Amount 12175.4
Showing Instructions Please enter all showing request in showing time
Middle/Junior High School William Paca Middle School
Building Area Units Square Feet
Standard Status Active
Middle/Junior School District William Floyd
Elementary School District William Floyd
Tax Assessed Value 2900
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ExteriorFencing Back Yard Fenced Vinyl
Parking Features Driveway Garage Driveway Garage
Water Source Public
Frontage Length 100 Feet
Waterfront Y/N Y
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* Excluded FeaturesList ByTina JahrsdoerferListing Agent
Affordability Calculator
- Monthly Principal & Interest
- $3,380
- Monthly Property Taxes
- $1,015
- Monthly Home Insurance
- --
Default based on a 30-year fixed rate of 6.25% with 20% down. The estimated payment is offered for convenience and is not an offer of credit. Due to market fluctuations, interest rates are subject to change at any time and without notice. Your individual rate may vary. Rates may differ for FHA, VA or jumbo loans.
Learn more about how to save NearbySingle family listings in Mastic Beach, NY
Average List Price $506,249
Percent of Sale Price 8%
About Mastic Beach, NY 13,666 Population
7% Since 2002
$ 64,970 Median Income
37.54 Median Age
29% Households with Children
Trends Information provided by ATTOM Data Solutions.
4099696 Elementary School
4098662 Middle School
William Floyd High School High School
Pricing History| Date | Price | Price Change | Description |
|---|
| 1/27/2026 | $549,000 | | Listed Price |