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15 Riverside Avenue, Mastic Beach NY 11951
15 Riverside Avenue, Mastic Beach NY 11951
New York>Suffolk County>Mastic

15 Riverside AvenueMastic Beach, NY 11951

For Sale

$659,999

Smart Buyer Rebate $4,000

Waterfront with breathtaking views and peaceful sunsets set the stage for this updated 4 Bedroom, 2.5 Bath Hi-Ranch on Poospatuck Creek, with direct access to the bay. Two boat slips.
The first level features updated flooring, Led lighting, summer kitchen, spacious living room, bedroom, ample storage and sliders to the deck, Cathedral ceilings and hardwood floors create a bright and open feel. This Main level offers two generously sized bedrooms, and a spacious primary with walk in closet and half bath. The remodeled kitchen features quartz countertops, while the living room with fireplace and an oversized picture window showcases the yard and water views. Sliders lead to the upper deck, the perfect place to relax, unwind and savor those spectacular sunsets.
Outside the home shines while you enjoy your private dock and a place to launch kayaks and paddleboat. From Poospatuck head to the bay for a day of fishing or simply enjoying life on the water.

NEW : 2025/2026 Trex decking on Upper and Lower Level, New Oil tank, New Gutters And Gutter guards

Listed by Maralyn C. Diggin CBR

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Douglas Elliman Real Estate

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516-681-2600

Last updated October 29, 2026

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Source: OneKey #1059003

Listing Facts

  • TypeSingle-family
  • NeighborhoodMastic
  • Bedrooms4
  • Bathrooms3
  • Days on Prevu18
  • Taxes$8,497.42/year
  • Size2,364 sqft
  • Price per sqft$279

Amenities

  • Dishwasher
  • Air Conditioning
  • Parking

Location

Mortgage Calculator

Listing History

10/29/2026
Price Decreased
$659,999
10/13/2026
Listed by Douglas Elliman Real Estate
$699,999
  1. 10/29/2026$659,999
    Price Decreased
  2. 10/13/2026$699,999
    Listed by Douglas Elliman Real Estate

Property Details for 15 Riverside Avenue

Exterior

Construction

  • Property Attached: Yes
  • Property Condition: Updated/Remodeled
  • Year Built: 1988
  • Architectural Style: Hi Ranch
  • Construction Materials: Vinyl Siding

Features

  • Waterfront Features: Canal Access, Creek, Water Access, Waterfront
  • Waterfront: Yes

Measurements

  • Building Area Total: 2,364
  • Building Area Units: Square Feet
  • Lot Size Acres: 0.25
  • Lot Size Square Feet: 10,890

Financial

Taxes

  • Parcel Number: 0200-940-00-05-00-024-000
  • Tax Annual Amount: $8,497.42
  • Tax Assessed Value: $1,995.00
  • Tax Year: 2026

Interior

Features

  • Appliances: Dishwasher, Refrigerator
  • Flooring: Combination, Hardwood
  • Interior Features: First Floor Bedroom, First Floor Full Bath

Measurements

  • Living Area: 2,364
  • Living Area Source: Public Records

Rooms

  • Bathrooms Full: 2
  • Bathrooms Half: 1
  • Bathrooms Total Integer: 3
  • Bedrooms Total: 4
  • Rooms Total: 8

Parking

Parking

  • Garage Spaces: 2
  • 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: Central Air
  • Heating: Oil
  • Sewer: Cesspool
  • Utilities: Cable Connected, Electricity Connected, Trash Collection Public
  • Water Source: Public

Frequently Asked Questions

How many bedrooms and bathrooms does this single-family home have?

There are 4 bedrooms and 3 bathrooms in this single-family home at 15 Riverside Avenue.

What schools are nearby to 15 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 are 2 parking spaces available for 15 Riverside Avenue.

What are the annual taxes for 15 Riverside Avenue?

Annual taxes for this single-family home are estimated at $8,497.

How does 15 Riverside Avenue compare to other single-family homes in Mastic?

This single-family home is listed 17% above the average price for single-family homes in Mastic and has been on the market for 54 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 2,364 sqft.

15 Riverside Avenue is a 4-bedroom, 3-bath single-family home for sale in Mastic Beach NY 11951. Listed on Prevu for 18 days at $659,999. This includes a recent price decrease of $40,000. This property features 2,364 square feet of living space, located in Mastic. The median listing price for single-family homes in this area is $555,000. Nearby schools include Tangier Smith Elementary School, William Paca Middle School, and William Floyd High School. Additional amenities include dishwasher, air conditioning, and 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.