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!
For sale
$799,000
21 Carleton Avenue, East Islip, NY 11730
4beds
216sqft
Duplex, Multi Family
Built in 1900
-- sqft lot
$-- Zestimate®
$3,699/sqft
$-- HOA
What's special
Modern comfortThree comfortable bedroomsBright inviting layoutSpacious first-floor unitTwo separate boilersGenerous living space
- 12 days
- 1,562
- 102
Likely to sell faster than
Zillow last checked:
Listing updated:
Listed by:
Century 21 Monticello Realty 718-804-5757,
Patricia V. Rodriguez
Source: OneKey® MLS as distributed by MLS GRID,MLS#: 1052970
Facts & features
Interior
Bedrooms & bathrooms
- Bedrooms: 4
- Bathrooms: 2
- Full bathrooms: 2
Heating
- Hot Water
Cooling
- Ductless
Features
- First Floor Bedroom
- Basement: Finished
Interior area
- Total structure area: 216
- Total interior livable area: 216 sqft
Property
Parking
- Total spaces: 6
- Parking features: Driveway
- Has garage: Yes
- Has uncovered spaces: Yes
Lot
- Size: 6,534 Square Feet
Details
- Parcel number: 0500372000200039000
- Special conditions: None
Construction
Type & style
- Home type: MultiFamily
- Property subtype: Duplex, Multi Family
Materials
- Frame
Condition
- Year built: 1900
Utilities & green energy
- Gas: Separate Gas Meters: 2
- Sewer: Public Sewer
- Water: Public
- Utilities for property: Cable Connected, Electricity Connected, Natural Gas Connected
Community & HOA
Location
- Region: East Islip
Financial & listing details
- Price per square foot: $3,699/sqft
- Tax assessed value: $33,500
- Annual tax amount: $12,517
- Date on market: 9/19/2026
- Cumulative days on market: 13 days
- Listing agreement: Exclusive Right To Sell
- Electric utility on property: Yes
Estimated market value
Not available
Estimated sales range
Not available
Not available
Price history
| Date | Event | Price |
|---|---|---|
| 9/19/2026 | Listed for sale | $799,000+63.1%$3,699/sqft |
Source: | ||
| 11/19/2021 | Sold | $490,000$2,269/sqft |
Source: Public Record Report a problem | ||
| 6/18/2021 | Sold | $490,000+30.7%$2,269/sqft |
Source: | ||
| 3/24/2021 | Listing removed | -- |
Source: Owner Report a problem | ||
| 6/18/2019 | Listing removed | $1,500$7/sqft |
Source: Owner Report a problem | ||
| 6/6/2019 | Listed for rent | $1,500$7/sqft |
Source: Owner Report a problem | ||
| 5/23/2019 | Sold | $375,000-6%$1,736/sqft |
Source: | ||
| 4/15/2019 | Pending sale | $399,000$1,847/sqft |
Source: Coach Real Estate Assoc Inc #3110042 Report a problem | ||
| 3/13/2019 | Listed for sale | $399,000+315.6%$1,847/sqft |
Source: Coach Real Estate Assoc Inc #3110042 Report a problem | ||
| 7/9/1998 | Sold | $96,000$444/sqft |
Source: Public Record Report a problem | ||
Public tax history
| Year | Property taxes | Tax assessment |
|---|---|---|
| 2025 | -- | $33,500 |
| 2024 | -- | $33,500 |
| 2023 | -- | $33,500 |
| 2022 | -- | $33,500 |
| 2021 | -- | $33,500 |
| 2020 | -- | $33,500 |
| 2019 | -- | $33,500 |
| 2018 | -- | $33,500 |
| 2017 | $11,889 | $33,500 |
| 2016 | -- | $33,500 |
| 2015 | -- | $33,500 |
| 2014 | -- | $33,500 |
| 2011 | -- | $33,500 |
| 2010 | -- | $33,500 |
| 2009 | -- | $33,500 |
| 2008 | -- | $33,500 |
| 2007 | $8,237 +20.4% | $33,500 |
| 2005 | $6,843 +9.2% | $33,500 |
| 2004 | $6,264 +35.4% | $33,500 +4.7% |
| 2003 | $4,626 +8.1% | $32,000 |
| 2002 | $4,279 | $32,000 |
| 2001 | -- | $32,000 |
| 2000 | $4,401 | $32,000 |
Find assessor info on the county website
Monthly payment
Climate risks
Neighborhood: 11730
Nearby schools
Schools provided by the listing agent
- Elementary: John F Kennedy Elementary School
- Middle: East Islip Middle School
- High: East Islip High School
Source: OneKey® MLS as distributed by MLS GRID. This data may not be complete. We recommend contacting the local school district to confirm school assignments for this home.



