Skip main navigation
For sale
  • Price cut: $140K (1/27)
    $549,000

    13 Riverside Avenue, Mastic Beach, NY 11951

    3beds
    2,340sqft
    Single Family Residence, Residential
    Built in 1972
    0.25 Acres Lot
    $-- Zestimate®
    $235/sqft
    $-- HOA

    What's special

    Split-level homeUnbeatable waterfront setting
    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.
    50 days
    |
    1,544
    |
    44
    |

    Zillow last checked: 7 hours ago

    Listing updated: March 15, 2026 at 11:39am

    Listing by:

    EXP Realty 888-276-0630,

    Tina Jahrsdoerfer 631-365-4231,

    Toni J. Flohr 516-901-6426,

    EXP Realty

    Source: OneKey® MLS as distributed by MLS GRID,MLS#: 955402MLS Logo

    Tour with a local agent

      Facts & features

      Interior

      Bedrooms & bathrooms
      • Bedrooms: 3
      • Bathrooms: 3
      • Full bathrooms: 3
      Heating
      • Baseboard, Hot Water, Oil
      Cooling
      • Wall/Window Unit(s)
      Appliances
      • Included: Gas Oven
      • Laundry: Washer/Dryer Hookup
      Features
      • First Floor Bedroom, First Floor Full Bath, Eat-in Kitchen, Open Floorplan, Primary Bathroom
      • Attic: Full,Pull Stairs
      • Has fireplace: No
      Interior area
      • Total structure area: 2,340
      • Total interior livable area: 2,340 sqft

      Property

      Parking
      • Total spaces: 1
      • Parking features: Driveway, Garage
      • Garage spaces: 1
      • Has uncovered spaces: Yes
      Features
      • Fencing: Back Yard,Fenced,Vinyl
      • Has view: Yes
      • View description: Water
      • Has water view: Yes
      • Water view: Water
      • Waterfront features: Bulkhead, Creek, River Access, Water Access, Waterfront
      • Frontage length: 100 Feet
      Lot
      • Size: 0.25 Acres
      Details
      • Parcel number: 0200940000500029000
      • Special conditions: None

      Construction

      Type & style
      • Home type: SingleFamily
      • Property subtype: Single Family Residence, Residential
      Materials
      • Vinyl Siding
      Condition
      • Year built: 1972

      Utilities & green energy

      • Sewer: Cesspool
      • Water: Public
      • Utilities for property: Cable Available, Electricity Connected, Propane, Trash Collection Public, Water Connected

      Community & HOA

      HOA
      • Has HOA: No
      Location
      • Region: Mastic Beach

      Financial & listing details

      • Price per square foot: $235/sqft
      • Tax assessed value: $2,900
      • Annual tax amount: $12,175
      • Date on market: 1/27/2026
      • Cumulative days on market: 50 days
      • Listing agreement: Exclusive Right To Sell
      • Electric utility on property: Yes

        Estimated market value

        Not available

        Estimated sales range

        Not available

        Not available

        Price history

        Price history
        DateEventPrice
        1/27/2026Price change$549,000-20.3%$235/sqft
        Source: OneKey® MLS as distributed by MLS GRID #955402 Report a problem
        11/28/2024Price change$689,000-5%$294/sqft
        Source: OneKey® MLS as distributed by MLS GRID #L3589422 Report a problem
        11/8/2024Listed for sale$725,000+31.8%$310/sqft
        Source: OneKey® MLS as distributed by MLS GRID #3589422 Report a problem
        9/18/2021Listing removed--
        Source: Exit Realty Report a problem
        7/20/2021Pending sale$550,000$235/sqft
        Source: OneKey® MLS as distributed by MLS GRID #3316548 Report a problem
        6/25/2021Price change$550,000+10.2%$235/sqft
        Source: OneKey® MLS as distributed by MLS GRID #3316548 Report a problem
        6/9/2021Listed for sale$499,316+137.8%$213/sqft
        Source: OneKey® MLS as distributed by MLS GRID #3316548 Report a problem
        9/4/2015Sold$210,000$90/sqft
        Source: OneKey® MLS as distributed by MLS GRID #L2763827 Report a problem

        Public tax history

        Public tax history
        YearProperty taxesTax assessment
        2017$12,846 $2,900
        2016-- $2,900
        2015-- $2,900
        2014-- $2,900
        2013-- $2,900
        2012-- $2,900
        2011-- $2,900
        2010-- $2,900
        2009-- $2,900
        2008-- $2,900
        2007$7,118 +26.5%$2,900
        2005$5,628 +6%$2,900
        2004$5,308 +6.6%$2,900
        2003$4,981 +7.1%$2,900
        2002$4,650 +5.7%$2,900
        2001$4,400 $2,900

        Find assessor info on the county website

        BuyAbility℠ payment

        Estimated monthly payment
        All calculations are estimates and provided by Zillow, Inc. for informational purposes only. Actual amounts may vary.
        HOA fees may include property taxes on listings classified as Co-Ops. Contact the listing agent and/or owner for fee details.
        Mortgage interest rates are dependent on a number of factors, including credit score, down payment, and repayment length. Interest rate data provided by Zillow Group Marketplace, Inc. as of 1/1/1970 from various mortgage lenders with which we have lead or other similar arrangements; the Estimated Payment is an average of those rates.
        See how much you could borrow to make a competitive offer.

        Boost your down payment with 6% savings match

        Earn up to a 6% match & get a competitive APY with a *. Zillow has partnered with to help get you home faster.

        Learn more*Terms apply. Match provided by Foyer. Account offered by Pacific West Bank, Member FDIC.

        Climate risks

        Neighborhood: 11951

        Getting around

        6 / 100
        Car-Dependent
        28 / 100
        Somewhat Bikeable

        Nearby schools

        GreatSchools rating
        Schools provided by the listing agent
        • Elementary: Tangier Smith Elementary School
        • Middle: William Paca Middle School
        • High: William Floyd High School

        Source: OneKey® MLS as distributed by MLS GRID. This data may not be complete. We recommend contacting the local school district to confirm school assignments for this home.

        Local experts in 11951

        Similar homes

        Skip to the end of the carouselSkip to the beginning of the carousel