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    Port Jefferson, NY Office Buildings for Sale

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    Coram, NY Selden, NY East Setauket, NY
    Professional Office Building For Sale
    $799,000
    5,000 SF
    Professional Office Building For Sale

    111 N Country Road, Port Jefferson, NY 11777

    Well-maintained 5,000 SF office building in Port Jefferson, NY.
    • Prime location in Port Jefferson, Long Island, close to hospitals, train, and bus lines.
    • Well‑maintained 5,000 SF professional office building with two modern units.
    • Major suite renovations completed in 2019.
    • Strong leasing history with upside potential.
    • Suitable for owner‑user or investment.
    Updated: Nov 21, 2025
    View details
    Office
    $799,000
    5,000 SF
    Office

    111 N Country Rd, Port Jefferson, NY 11777

    Office buildings · 5,000 SF
    • Well‑maintained 5,000 SF professional office building in Port Jefferson, NY.
    • Two modern office suites with major renovations completed in 2019.
    • Located within the Village of Port Jefferson's PO (professional office) zoning.
    • Strong occupancy history with upside potential.
    • Convenient location near Northwell's John T. Mather Hospital and Catholic Health's St. Charles Hospital.
    Updated: Jul 2, 2024
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    Based on your search, we've compiled 37 Potential Opportunities for your consideration. Besides 2 Active listings in Port Jefferson, NY, we suggest exploring several alternatives: 4 properties in Nearby Cities, and similar 27 Off-Market properties to explore as potential leads, plus 4 Land Listings that present a potential for development.

    Opportunities in Nearby Cities

    Here are 4 Similar properties we found in Nearby Locations for your consideration.

    Professional Office Building on Route 25
    $875,000
    3,486 SF
    Professional Office Building on Route 25

    3,486 SF office building with owner-user suite and lease-up upside.

    1814 Middle Country Road, Ridge, NY 11961

    View details
    Professional Office Building on Route 25
    $875,000
    3,486 SF
    Professional Office Building on Route 25

    3,486 SF office building with owner-user suite and lease-up upside.

    1814 Middle Country Road, Ridge, NY 11961

    View details
    Commercial Building in Ronkonkoma, NY
    $650,000
    2,300 SF
    Commercial Building in Ronkonkoma, NY

    Updated Hi-Ranch with modern amenities and convenient location.

    294 Fir Grove Rd, Ronkonkoma, NY 11779

    View details
    Ronkonkoma Avenue Freestanding Office Building
    $749,000
    1,400 SF
    Ronkonkoma Avenue Freestanding Office Building

    Freestanding, renovated office building with two suites and ample parking.

    218 Ronkonkoma Ave, Ronkonkoma, NY 11779

    View details

    Potential Development Sites for Consideration

    Can't find the perfect fit? These Land listings present an alternative path: the potential to develop a property for your specific goals.

    Important: These AI-suggestions are a starting point, not a guarantee of permitted use. All zoning, permitting, and land use information must be independently verified by you with the appropriate local authorities before making any commitments.

    Rocky Point Commercial Lot
    $390,000
    0.41 Acres
    Rocky Point Commercial Lot

    J-2 zoned commercial lot in Rocky Point, NY.

    N Country Roads, Rocky Point, NY

    View details
    Commercial Land Near Montauk Highway
    $699,000
    0.50 Acres
    Commercial Land Near Montauk Highway

    Vacant commercial lot near Montauk Hwy, Shirley, NY.

    V/L Versa Place, Shirley, NY 11967

    View details
    Commercial Land Near Montauk Highway
    $699,000
    0.50 Acres
    Commercial Land Near Montauk Highway

    Prime commercial lot near shopping, zoned J6, approved for building.

    V/L Versa Place, Shirley, NY 11967

    View details
    Commercial Land in Mastic, NY
    $749,500
    0.31 Acres
    Commercial Land in Mastic, NY

    Commercial land near shopping center and residential neighborhoods.

    1287 Montauk Highway, Mastic, NY 11950

    View details

    Off-Market Properties in Port Jefferson, NY

    Consider similar Off-Market properties in Port Jefferson, NY. You may contact the owners directly to inquire about their potential intentions to sell. To help you make a strong first impression, we can assist by reaching out to these owners with compelling proposals created using our AI tool.

    518-526 Main St

    518-526 Main St

    OFFICE BUILDING • 4,400 SF
    Value Estimation
    $3,200,000
    518-526 Main St, Port Jefferson, NY 11777
    View details
    12 Walnut St

    12 Walnut St

    OFFICE BUILDING • 0.11 Acres
    Value Estimation
    $710,000
    12 Walnut St, Port Jefferson, NY 11777-2164
    View details
    640 Belle Terre Rd

    640 Belle Terre Rd

    PROFESSIONAL BUILDING • 0.15 Acres
    Value Estimation by Request
    640 Belle Terre Rd, Port Jefferson, NY 11777-1936
    View details
    640 Belle Terre Rd

    640 Belle Terre Rd

    PROFESSIONAL BUILDING • 0.28 Acres
    Value Estimation
    $725,000
    640 Belle Terre Rd, Port Jefferson, NY 11777-1936
    View details
    620 Belle Terre Rd

    620 Belle Terre Rd

    PROFESSIONAL BUILDING • 0.64 Acres
    Value Estimation by Request
    620 Belle Terre Rd, Port Jefferson, NY 11777-2500
    View details
    640 Belle Terre Rd

    640 Belle Terre Rd

    PROFESSIONAL BUILDING • 0.06 Acres
    Value Estimation by Request
    640 Belle Terre Rd, Port Jefferson, NY 11777-1936
    View details
    1000 Main St

    1000 Main St

    PROFESSIONAL BUILDING • 0.25 Acres
    Value Estimation by Request
    1000 Main St, Port Jefferson, NY 11777-2250
    View details
    1227 Main St

    1227 Main St

    OFFICE BUILDING • 0.24 Acres
    Value Estimation by Request
    1227 Main St, Port Jefferson, NY 11777-2227
    View details
    39 Broadway

    39 Broadway

    OFFICE BUILDING • 0.04 Acres
    Value Estimation by Request
    39 Broadway, Port Jefferson, NY 11777-1201
    View details
    39 Broadway

    39 Broadway

    OFFICE BUILDING • 0.04 Acres
    Value Estimation by Request
    39 Broadway, Port Jefferson, NY 11777-1201
    View details
    39 Broadway

    39 Broadway

    OFFICE BUILDING • 0.04 Acres
    Value Estimation by Request
    39 Broadway, Port Jefferson, NY 11777-1201
    View details
    640 Belle Terre Rd

    640 Belle Terre Rd

    PROFESSIONAL BUILDING • 0.22 Acres
    Value Estimation by Request
    640 Belle Terre Rd, Port Jefferson, NY 11777-1936
    View details
    640 Belle Terre Rd

    640 Belle Terre Rd

    PROFESSIONAL BUILDING • 0.15 Acres
    Value Estimation by Request
    640 Belle Terre Rd, Port Jefferson, NY 11777-1936
    View details
    635 Belle Terre Rd

    635 Belle Terre Rd

    PROFESSIONAL BUILDING • 3.00 Acres
    Value Estimation by Request
    635 Belle Terre Rd, Port Jefferson, NY 11777-1935
    View details
    640 Belle Terre Rd

    640 Belle Terre Rd

    OFFICE BUILDING • 0.08 Acres
    Value Estimation by Request
    640 Belle Terre Rd, Port Jefferson, NY 11777-1936
    View details
    251 Oakland Ave

    251 Oakland Ave

    PROFESSIONAL BUILDING • 0.98 Acres
    Value Estimation by Request
    251 Oakland Ave, Port Jefferson, NY 11777-2602
    View details
    70 Country Rd

    70 Country Rd

    PROFESSIONAL BUILDING • 3.44 Acres
    Value Estimation by Request
    70 Country Rd, Port Jefferson, NY 11777-2161
    View details
    640 Belle Terre Rd

    640 Belle Terre Rd

    PROFESSIONAL BUILDING • 0.15 Acres
    Value Estimation by Request
    640 Belle Terre Rd, Port Jefferson, NY 11777-1936
    View details
    646 Main St

    646 Main St

    OFFICE BUILDING • 0.34 Acres
    Value Estimation by Request
    646 Main St, Port Jefferson, NY 11777-2235
    View details
    414 Main St

    414 Main St

    OFFICE BUILDING • 0.87 Acres
    Value Estimation by Request
    414 Main St, Port Jefferson, NY 11777-1686
    View details
    118 Country Rd

    118 Country Rd

    PROFESSIONAL BUILDING • 1.23 Acres
    Value Estimation by Request
    118 Country Rd, Port Jefferson, NY 11777-2120
    View details
    116 Oakland Ave

    116 Oakland Ave

    OFFICE BUILDING • 0.34 Acres
    Value Estimation by Request
    116 Oakland Ave, Port Jefferson, NY 11777-2172
    View details

    Port Jefferson, NY Office Buildings Investment Opportunities Market Analysis

    Explore 29 office buildings for sale in Port Jefferson, NY on our real estate platform. These investment opportunities span a total of 10,000 square feet of properties for sale, with an estimated market value of $1,598,000.

    Sale prices for office properties in Port Jefferson, NY start at $799,000, averaging $799,000, and reaching up to $799,000 — offering options for a variety of budgets and business needs. Daily updated analytics ensure you stay ahead with the latest data and market trends.

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    6-Month New Listing Trend

    Monthly new listing volume vs. 6-month average in Port Jefferson.

    Top Commercial Asset Segments

    Office Units 7
    Office buildings 2
    Medical Office Space 1

    Property Size Breakdown

    The majority of commercial real estate listings in Port Jefferson fall within the 2,500 to 5,000 square foot range.

    Demographics Overview

    Population 9,347
    Population Growth (5Y) +4.4%
    Median Household Income $148,519

    High-Yield Neighborhoods for Strategic Investment

    Identify Port Jefferson submarkets with the highest inventory density on the market and evaluate the median listing prices of real estate assets

    Neighborhood Average Price
    11777 $799K

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