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MLS ID KEY967520Last updated Oct 1, 2026

Single Family

4 Riverside Avenue

Active · Brookhaven · Suffolk County, NY 11951

Bedrooms
3 Beds
Bathrooms
3 Baths
Year built
1955
Est. monthly taxes
$716.84
Property gallery0 / 15
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About this home

Rare opportunity in Mastic Beach. Fully renovated Cape on a private 1+ acre corner lot with river views, modern upgrades throughout, and flexible living space including a possible 4th bedroom or office. Welcome to 4 Riverside Avenue, a beautifully updated home that offers the perfect combination of space, privacy, and modern comfort. This property stands out with its oversized lot, thoughtful renovation, and peaceful natural surroundings. The home features 3 spacious bedrooms, a potential 4th bedroom or office space, and 3 full bathrooms, providing flexibility for today's lifestyle. Natural light fills the home, highlighting the neutral color palette and hardwood floors throughout, creating a warm and inviting atmosphere from the moment you enter. The fully renovated kitchen is designed for both everyday living and entertaining, featuring brand new stainless steel appliances, granite countertops, and custom cabinetry. The bathrooms have been updated with modern tile finishes, adding a fresh and clean design throughout the home. Major upgrades include a new roof (2026), new electric, new fencing, and updated landscaping. The elegant Mountain Black metal roof adds both durability and striking curb appeal. The spacious basement with walkout access provides excellent potential for additional living space. With areas ideal for a bar, cinema room, recreation space, or future finishing, the lower level offers incredible versatility. Outside, the property truly shines. Sitting on over an acre of land, the home features new trees, fresh landscaping, a fenced front yard, and a fenced backyard, creating a peaceful outdoor setting with plenty of room to relax, entertain, or expand. This home offers convenient access to nearby parks, waterfront areas, shopping, and local amenities. If you are looking for a fully renovated, move in ready home with space, privacy, and modern upgrades on a rare oversized lot with river views, this is one you will want to see in person.

Listing snapshot

Days on site
29 days
Listed on MLS
Mar 4, 2026
Full baths
3
Half baths
0
Annual property tax (MLS)
$8,602.14
Tax year
2025
Area source (MLS)
Other
Listing brokerage
Signature Premier Properties
MLS ID
KEY967520
Last updated
Oct 1, 2026

General features

Property type
Single Family
Property subtype
Single Family Residence
Year built
1955
Garage
No
Parking
Driveway, Oversized, Private
Water source
Public
Sewer
Cesspool
Utilities
Cable Available, Cable Connected, Electricity Available, Electricity Connected, See Remarks, Trash Collection Public, Water Available, Water Connected

Interior features

Basement
Full, Walk-Out Access
Heating
Electric, ENERGY STAR Qualified Equipment
Cooling
Electric, ENERGY STAR Qualified Equipment, Multi Units, Wall/Window Unit(s), Zoned
Interior
First Floor Bedroom, First Floor Full Bath, Chefs Kitchen, Crown Molding, Formal Dining, Open Floorplan, Primary Bathroom, Walk-In Closet(s)
Appliances
Dishwasher, Electric Range, Electric Water Heater, ENERGY STAR Qualified Appliances, Microwave
Flooring
Hardwood
Fireplace
Yes

Exterior features

Architectural style
Cape Cod
Construction materials
Brick
Private pool
No

Schools (MLS)

Elementary school
Nathaniel Woodhull Elementary School
Elementary school district
William Floyd
Middle school
William Floyd Middle School
Middle school district
William Floyd
High school
William Floyd High School
High school district
William Floyd

School information is provided by the MLS. Confirm attendance eligibility with the school district.

Recent activity

  1. Listing updated from MLS
  2. First seen on this site
  3. MLS status changed

Location

Brookhaven · Suffolk County, NY 11951Show interactive map
4 Riverside Avenue

Brookhaven · Suffolk County, NY 11951

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Estimate monthly payment

Loan detailsFixed-rate, fully amortizing loan. Edit the assumptions below; no market rate is supplied.
Property expenses (USD)
MLS amounts are prefilled when available and can be edited. Confirm what fees include. Unknown fee frequencies cannot be converted automatically.Property expenses: MLS values where available; missing values stay blank.

Estimated monthly principal & interest—

Monthly property taxNot provided

Monthly association / maintenance feesNot provided

Estimated monthly total of entered costs—

Excludes insurance, mortgage insurance, special assessments and lender fees. MLS taxes may reflect abatements or exemptions and can change.

Listing data is supplied by the MLS and may change without notice.