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    High-Visibility Commercial Property on Carleton Avenue Title is generated by Realmo AI

    55 Carleton Avenue, East Islip, NY 11730

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    Claim this Listing
    For Sale
    $1,650,000

    SINGLE_FAMILY - East Islip, NY

    Type:Office
    Lot size:
    0.98 Acres
    Added:
    Oct 24, 2025
    Days on Market:
    211
    Last Refresh:
    May 22 at 2:06 am

    Property Features for 55 Carleton Avenue

    General Information

    Property type
    Residential
    Property subtype
    Office
    Zoning
    GSD
    Rooms
    Basement
    Parking
    18
    Fencing
    Chain Link
    Basement
    Unfinished
    Standard status
    Active
    APN
    0500-346-00-03-00-073-000
    Lot size
    0.98 Acres

    Taxes and HOA fees

    Tax Year
    2025
    Tax Annual Amount
    29360

    Utilities

    Utilities
    Cable Available
    Sewer type
    Public Sewer
    Heating system
    Natural Gas, Forced Air
    Cooling system
    Central Air
    Water source
    Public

    Building Details

    Year built
    1975
    Floors in Building
    1
    Number of units
    8
    Flooring type
    Combination
    Building materials
    Brick, Fiberglass Insulation, Stucco

    We can help!

    Listing Contact
    Joseph E. Donaghy

    Listing agent Joseph E. Donaghy License #10401392754

    Listing office Marylou Swan Realty Corp 322 S Country Rd, East Patchogue, NY

    Listing date Oct 24, 2025

    MLS# 928396

    Copyright © 2026 OneKey MLS. All rights reserved. All information provided by the listing agent/broker is deemed reliable but is not guaranteed and should be independently verified.

    HighLights

    • High‑visibility 0.98‑acre commercial property on Carleton Avenue.
    • Zoned GSD, ideally suited for office, medical, or veterinary use.
    • Opportunity for expansion of up to 11,000 sq. ft. or redevelopment up to 17,000 sq. ft.
    • Prime location in East Islip with strong commercial activity and desirable demographics.
    • Easy access to Sunrise Hwy and Southern State Parkway.
    • Close proximity to Federal Court House (2 miles) and Northwell South Shore University Hospital (2.5 miles).

    Overview

    This 0.98-acre commercial property is located on Carleton Avenue in East Islip. Zoned GSD, the site is suited for office, medical, or veterinary use, offering exposure and accessibility. There is an opportunity for expansion of additional space of up to 11,000 sq. ft. or redevelop the entire site for a new building up to 17,000 sq. ft. The property is located two miles from the Federal Court House and 2.5 miles from Northwell South Shore University Hospital, with access from Sunrise Hwy and Southern State Parkway. The East Islip area is noted for commercial activity, making this a location for professional services seeking growth and visibility.
    Property Profile Insight Report Location Intelligence

    Current Use by Public Records

    Star Care Dialysis Physician Susan Pilon, LCSW Foster Care Service Brandon J. Broderick, ... Law Firm Melissa A Alkire Massage ... Alternative Medicine Practice Nicole Sewell Counselor

    Suggested Use

    Real Estate Agency Law Firm Restaurant Spa & Massage Center Dental Office Hair Salon Nail Salon Building Supply Gym & Fitness Center Pharmacy

    Zoning and permitted uses should be independently verified with local authorities.

    Similar Places Nearby

    • East Islip TV Mounting — Adams St E, East Islip, NY 11730, United States

    Location Insight

    • Map
    • Local Demand
    City
    East Islip
    County
    Suffolk
    State
    New York
    Longitude
    -73.190617
    Latitude
    40.733431

    Nearby Similar for Sale

    • $800,000

      Renovated Multi-Tenant Office Building

      Professional office building with strong rental potential in East Islip.
      128 Carleton Avenue, East Islip, NY 11730
      View Details
    • $799,000

      Two-Family Residence Near Railroad

      Two identical residences close to shopping and the train station.
      73-75 Washington Street, East Islip, NY 11730
      View Details

    FAQs

    What type of property is this?
    Office space - 0.98-acre commercial property suited for office, medical, or veterinary use.
    Where is this office space located?
    The property is located at 55 Carleton Avenue East Islip, NY.
    What is the asking price?
    The asking price for this property is $1,650,000.
    What are key features of this property?
    This property features: High‑visibility 0.98‑acre commercial property on Carleton Avenue.; Zoned GSD, ideally suited for office, medical, or veterinary use.; Opportunity for expansion of up to 11,000 sq. ft. or redevelopment up to 17,000 sq. ft.
    (631) 774-9671
    We can help!
    Listing Contact
    Joseph E. Donaghy
    Real Estate License ID: 10401392754
    Learn More
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    Realmo Value Estimations

    Realmo estimates a property’s market value using a proprietary methodology that incorporates public data and user-submitted information. This cumulative value is generated by integrating a variety of conventional and innovative methods. 

    Disclaimer

    These figures are not official appraisals and should not be used as a substitute for a valuation performed by a licensed appraiser.
    Actual market value may differ due to factors not captured in the data. Estimates are offered for informational purposes only, and users should conduct independent research before making financial or investment decisions.
    By using this feature, you acknowledge that Realmo is not responsible for actions taken based on these estimates.

    AI approach

    Realmo AI Method estimates property value using machine learning models trained on millions of comparable listings, transactions, and market signals. It analyzes property features, location intelligence data, and current market dynamics to predict the most probable market value in real time.

    Realmo CapRate Calculation

    Realmo calculates the Capitalization Rate (Cap Rate) to help estimate a property's potential return on investment. The Cap Rate is a fundamental metric in commercial real estate that measures the relationship between a property's net operating income and its market value.

    How We Calculate Cap Rate

    Cap Rate Formula:
    Cap Rate (%) = (Net Operating Income / Property Value) × 100

    Net Operating Income (NOI) Formula:
    NOI = Area × Lease Rate × (1 - Vacancy Rate) × (1 - Operating Expense Ratio)

    Components

    Net Operating Income (NOI) represents the annual income a property generates after operating expenses:

    • Area: Building square footage from property records
    • Lease Rate: Annual $/sqft based on market data for the property type and geographic location
    • Vacancy Rate: Percentage of unoccupied space based on market data for the property type and location
    • Operating Expense Ratio: Operating costs as a percentage of income, varies by property type

    Property Value is derived from:

    • Recent sale price (if available)
    • Statistical models using comparable sales
    • AI-powered valuation estimates

    Example Calculation

    For a 100,000 sqft Office Building:

    • Lease Rate: $25.00/sqft/year (market data for Office in this area)
    • Vacancy Rate: 8% (market data for Office in this area)
    • Operating Expense Ratio: 35% (typical for Office properties)
    • Property Value: $15,000,000

    Step 1: Calculate NOI

    NOI = 100,000 × $25.00 × (1 - 0.08) × (1 - 0.35)
    NOI = 100,000 × $25.00 × 0.92 × 0.65
    NOI = $1,495,000/year

    Step 2: Calculate Cap Rate

    Cap Rate = ($1,495,000 / $15,000,000) × 100
    Cap Rate = 9.97%

    Property Type Considerations

    Net Operating Income calculations vary by property type due to different operating expense ratios:

    • Office: Higher expenses (30-40%) for HVAC, utilities, maintenance
    • Retail: Moderate expenses (25-35%) for common area maintenance
    • Industrial/Warehouse: Lower expenses (15-25%) for minimal tenant services
    • Multifamily: Moderate expenses (35-45%) including property management
    • Self-Storage: Lower expenses (25-35%) due to minimal maintenance

    Market lease rates and vacancy rates are specific to each property type and geographic location, reflecting local market conditions.

    Disclaimer

    These calculations are estimates for informational purposes only and should not be used as a substitute for professional financial analysis or appraisal.

    • Cap Rate calculations depend on market data that may change over time
    • Actual operating expenses, lease rates, and vacancy rates may differ from market averages
    • Individual property conditions, lease terms, and tenant quality significantly impact actual NOI
    • Property value estimates are approximations and not official appraisals
    • Cap rates vary widely by market, property condition, and investment risk profile

    Professional Guidance Recommended: Before making any investment or financial decisions, consult with licensed appraisers, commercial real estate brokers, and financial advisors who can evaluate your specific property and circumstances.
    By using this feature, you acknowledge that Realmo is not responsible for investment decisions or actions taken based on these estimates.

    Cap approach

    Capitalization Method calculates value based on estimated net operating income (NOI) and applying a market-based capitalization rate (cap rate), we estimate what a typical investor might be willing to pay for it.

    Comparable approach

    Comparable estimate is based on recent sales of similar nearby properties, adjusted for factors like size, condition, and location.

    Relative

    Relative property class coefficient uses factors that account for typical price differences between various asset types (e.g., retail vs. industrial) to provide a more accurate market-aligned estimate.

    Geo

    Comparable Sales Method, enhanced by Geo coefficients — location-based adjustment factors that reflect differences in price levels across neighborhoods, cities, or regions ensuring a more accurate, market-sensitive valuation.

    Stat Estimate

    This method estimates value based on actual market adjusted recent (~5 years) sales of comparable properties around by location and property type.

    • Ranges - area data calculated by industry standard IQR Outlier Removal Method
    • Range-from: 75% of all similar sales ($/sqft) are above this value
    • Range-to: 75% of all similar sales ($/sqft) are below this value
    AI Estimate

    This method estimates value based on AI market estimation of comparable properties around by location and property type.

    • Ranges - area data calculated by industry standard IQR Outlier Removal Method
    • Range-from: 75% of all estimations ($/sqft) are above this value
    • Range-to: 75% of all estimations ($/sqft) are below this value
    Alternative use

    Estimate considers the property’s potential value if used for a different purpose-based on zoning, demand, and market feasibility.

    More about this property
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