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13 Riverside AvenueMastic Beach, NY 11951

For Sale

$549,000

Smart Buyer Rebate $1,225

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

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EXP Realty

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888-276-0630

Listed by Toni J. Flohr

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EXP Realty

Last updated January 28, 2026

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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
  • Middle Or Junior School District: William Floyd

Utilities

Equipment

  • Cooling: Wall/Window Unit(s)
  • Heating: Baseboard, Hot Water, Oil
  • Sewer: Cesspool
  • Utilities: Cable Available, Electricity Connected, Propane, Trash Collection Public, Water Connected
  • Water Source: Public

Frequently Asked Questions

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.

Full MLS Disclaimers

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.