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.
Listed by Tina Jahrsdoerfer
·
EXP Realty
·
888-276-0630
Listed by Toni J. Flohr
·
EXP Realty
Last updated January 28, 2026
·
Source: OneKey #955402
Listing Facts
TypeSingle-family
NeighborhoodMastic
Bedrooms3
Bathrooms3
Days on Prevu2
Taxes$12,175.4/year
Size2,340 sqft
Price per sqft$235
Amenities
Parking
Location
Mortgage Calculator
Listing History
01/27/2026
Listed by EXP Realty
$549,000
Property Details for 13 Riverside Avenue
Exterior
Construction
Year Built: 1972
Architectural Style: Split Level
Construction Materials: Vinyl Siding
Features
Fencing: Back Yard, Fenced, Vinyl
View: Water
Waterfront Features: Bulkhead, Creek, River Access, Water Access, Waterfront
Waterfront: Yes
Measurements
Building Area Units: Square Feet
Frontage Length: 100
Lot Size Acres: 0.25
Lot Size Square Feet: 10,890
Financial
Taxes
Parcel Number: 0200-940-00-05-00-029-000
Tax Annual Amount: $12,175.40
Tax Assessed Value: $2,900.00
Tax Year: 2025
Interior
Features
Appliances: Gas Oven
Interior Features: First Floor Bedroom, First Floor Full Bath, Eat-in Kitchen, Open Floorplan, Primary Bathroom, Washer/Dryer Hookup
Measurements
Living Area: 2,340
Living Area Source: Other
Rooms
Bathrooms Full: 3
Bathrooms Total Integer: 3
Bedrooms Total: 3
Rooms Total: 10
Parking
Parking
Garage Spaces: 1
Garage: Yes
Parking Features: Driveway, Garage
Schools
Elementary School
Elementary School: Tangier Smith Elementary School
Elementary School District: William Floyd
High School
High School: William Floyd High School
High School District: William Floyd
Middle or Junior School
Middle Or Junior School: William Paca Middle School
How many bedrooms and bathrooms does this single-family home have?
There are 3 bedrooms and 3 bathrooms in this single-family home at 13 Riverside Avenue.
What schools are nearby to 13 Riverside Avenue?
Nearby schools include the Tangier Smith Elementary School, William Paca Middle School, and William Floyd High School.
Does this single-family home have parking?
Yes, there is 1 parking space available for 13 Riverside Avenue.
What are the annual taxes for 13 Riverside Avenue?
Annual taxes for this single-family home are estimated at $12,175.
How does 13 Riverside Avenue compare to other single-family homes in Mastic?
This single-family home is listed 7% above the average price for single-family homes in Mastic and has been on the market for 93 less days than the typical home in this area.
What is the square footage on this single-family home?
According to the MLS, this listing is 2,340 sqft.
13 Riverside Avenue is a 3-bedroom, 3-bath single-family home for sale in Mastic Beach NY 11951. Available on Prevu for 2 days at $549,000. This home features 2,340 square feet of living space, located in Mastic. The median listing price for single-family homes in this area is $499,990. Nearby schools include Tangier Smith Elementary School, William Paca Middle School, and William Floyd High School. The home offers parking. Explore more single-family home listings in Suffolk County.
The data relating to real estate for sale on this website comes in part from the IDX
Program of OneKey™ MLS. The source of the displayed data is either the property owner
or public record provided by non-governmental third parties. It is believed to be reliable
but not guaranteed. This information is provided exclusively for consumers’ personal,
non-commercial use. Information Copyright 2026, OneKey™ MLS. All Rights Reserved.
Rebate estimate is indicative only and based on listing price and estimated buyer's agent commission paid by owner, if applicable. Final rebates are subject to Terms of Use and may vary due to final negotiated transaction terms.