Recently Listed Open House 10/3 12:30pm - 3pm
21 Carleton Avenue
East Islip, NY, 11730 $ 799,000
Bedrooms4 Baths2.0 Sq 216 Monthly Estimate*
$ 5,045
for $799,000 with 4 bedrooms and 2 full baths. This 216 square foot home was built in 1900 on a lot size of 0.15.
Welcome to East Islip, NY 11730, a beautifully upgraded two-family residence offering generous living space, modern comfort, and an exceptionally convenient location. This well-maintained property is an excellent opportunity for an owner-occupant, investor, or buyer seeking flexible living arrangements with the benefit of two separate units. The spacious first-floor unit features three comfortable bedrooms and a bright, inviting layout designed for everyday living and entertaining. The second-floor unit offers one bedroom with its own private living space, making it ideal for rental income, guests, or additional household needs. The home has been fully upgraded, allowing the next owner to move in and enjoy its many improvements. For added comfort and efficiency, the property is equipped with two separate boilers and five energy-efficient split HVAC units, providing flexible heating and cooling throughout the home. A large private driveway can accommodate up to six vehicles, a valuable feature for a two-family property. Conveniently located approximately 10 minutes from the Long Island Rail Road, this home provides an easy commute to New York City and surrounding Long Island communities. It is also close to major roadways, shopping malls, supermarkets, restaurants, local stores, schools, parks, and other everyday necessities. With its upgraded condition, separate living spaces, modern heating and cooling systems, generous parking, and convenient East Islip location, offers an outstanding combination of comfort, convenience, and income-producing potential. Don’t miss the opportunity to own this versatile two-family home in one of Long Island’s desirable communities. Schedule your private showing today!
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Open House
10/3/2026 12:30 PM - 3:00 PM
21 Carleton Avenue East Islip, NY
* Some states or local ordinances may prohibit Open Houses at this time, please confirm with your Weichert agent or local rep to confirm
FeaturesInteriorInterior Amenities First Floor Bedroom
Basement Finished
Basement Features Finished
Basement (Y/N) N
Total Bedrooms 4
Total Baths 2
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GeneralSewer Public Sewer
Heating Hot Water
Cooling Ductless
Utilities Cable Connected Electricity Connected Natural Gas Connected
Garage Spaces 0
Construction Materials Frame
Year Built 1900
Property Subtype Duplex
Tax Year 2026
Parcel Number 0500-372-00-02-00-039-000
County Suffolk County
Property Type Residential Income
Garage Y/N Y
Full Baths 2
High School East Islip High School
City Islip
Senior Community Y/N N
High School District East Islip
Number Of Units Total 2
Carport Y/N N
Elementary School John F Kennedy Elementary School
Property Attached Y/N N
Tax Annual Amount 12517
Middle/Junior High School East Islip Middle School
Building Area Units Square Feet
Standard Status Active
Middle/Junior School District East Islip
Elementary School District East Islip
Tax Assessed Value 33500
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ExteriorParking Features Driveway Driveway
Water Source Public
Total Parking 6
Parking Spaces 6
Building Area Total 216
Waterfront Y/N N
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* Excluded FeaturesList ByPatricia V. RodriguezListing Agent
Century 21 Monticello RealtyBroker
Affordability Calculator
- Monthly Principal & Interest
- $5,045
- Monthly Property Taxes
- $1,043
- Monthly Home Insurance
- --
Default based on a 30-year fixed rate of 6.49% with 20% down. The estimated payment is offered for convenience and is not an offer of credit. Due to market fluctuations, interest rates are subject to change at any time and without notice. Your individual rate may vary. Rates may differ for FHA, VA or jumbo loans.
Learn more about how to save NearbyMulti-family listings in East Islip, NY
Average List Price $847,000
Percent of Sale Price 6%
About East Islip, NY 15,007 Population
1% Since 2002
$ 114,842 Median Income
43.37 Median Age
34% Households with Children
Trends Information provided by ATTOM Data Solutions.
4103402 Elementary School
4099840 Middle School
East Islip High School High School
Pricing History| Date | Price | Price Change | Description |
|---|
| 9/19/2026 | $799,000 | | Listed Price |