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For sale
  • $799,000

    21 Carleton Avenue, East Islip, NY 11730

    4beds
    216sqft
    Loading
    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
    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!
    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#: 1052970MLS Logo

      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

        DateEventPrice
        9/19/2026Listed for sale$799,000+63.1%$3,699/sqft
        Source: OneKey® MLS as distributed by MLS GRID #1052970 Report a problem
        11/19/2021Sold$490,000$2,269/sqft
        Source: Public Record Report a problem
        6/18/2021Sold$490,000+30.7%$2,269/sqft
        Source: OneKey® MLS as distributed by MLS GRID #L3297949 Report a problem
        3/24/2021Listing removed--
        Source: Owner Report a problem
        6/18/2019Listing removed$1,500$7/sqft
        Source: Owner Report a problem
        6/6/2019Listed for rent$1,500$7/sqft
        Source: Owner Report a problem
        5/23/2019Sold$375,000-6%$1,736/sqft
        Source: OneKey® MLS as distributed by MLS GRID #L3110042 Report a problem
        4/15/2019Pending sale$399,000$1,847/sqft
        Source: Coach Real Estate Assoc Inc #3110042 Report a problem
        3/13/2019Listed for sale$399,000+315.6%$1,847/sqft
        Source: Coach Real Estate Assoc Inc #3110042 Report a problem
        7/9/1998Sold$96,000$444/sqft
        Source: Public Record Report a problem

        Public tax history

        YearProperty taxesTax 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

        Estimated monthly payment$1,822
        All calculations are estimates and provided by Zillow, Inc. for informational purposes only. Actual amounts may vary.
        HOA fees may include property taxes on listings classified as Co-Ops. Contact the listing agent and/or owner for fee details.
        See how much you could borrow to make a competitive offer.

        Climate risks

        Neighborhood: 11730

        Getting around

        83 / 100
        Very Walkable
        51 / 100
        Bikeable

        Nearby schools

        GreatSchools rating
        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.

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