Office Building with Expansion
For Sale
$1,650,000
55 Carleton Avenue, East Islip, NY 11730
Commercial Sale, East Islip, NY
Property SizeContact for details
Lot Size0.98 Acres
Days on Market347
Property Features for 55 Carleton Avenue
General Information
Property type
Commercial Sale
Property subtype
Office
Zoning
GSD
Rooms
Basement
Parking
18
Fencing
Chain Link
Basement
Unfinished
Directions
From Sunrise Hwy, take exit 46 South Carleton Ave. Continue south for approximately 1 mile crossing Union Blvd, 55 Carleton is located on the east side before Main Street. From Main Street, go north approximately 200 ft. on the right.
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
Forced Air, Natural Gas
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
Listing Agency:
Marylou Swan Realty Corp
(631) 289-5550
Listed By:
Joseph E. Donaghy · License #10401392754
(631) 774-9671
Added: Oct 24, 2025
Changed: Sep 28
Last Checked: Oct 5 at 7:06PM
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.
Investment Insights
Based on property information with market context.
This GSD-zoned office property includes a basement and a combination of brick, fiberglass insulation, and stucco construction materials. Building systems include natural-gas forced-air heating and central air conditioning, with public water, public sewer, cable availability, and chain-link fencing also identified. The property was built in 1975 and has combination flooring.
The 0.98-acre site is located at 55 Carleton Avenue in East Islip, along the main thoroughfare into the area. The property is approximately 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 site supports expansion of up to 11,000 sq. ft. or redevelopment with a new building of up to 17,000 sq. ft. The stated use potential includes office, medical, and veterinary applications.
The 0.98-acre site is located at 55 Carleton Avenue in East Islip, along the main thoroughfare into the area. The property is approximately 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 site supports expansion of up to 11,000 sq. ft. or redevelopment with a new building of up to 17,000 sq. ft. The stated use potential includes office, medical, and veterinary applications.
Key Highlights
- 0.98‑acre GSD‑zoned office property at 55 Carleton Avenue
- Expansion potential of up to 11,000 sq. ft.
- Redevelopment potential for a new building of up to 17,000 sq. ft.
Property Analytics
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Current Use
Lease Details
Yes
Highway access
Yes
Paved road access
Location Intelligence
Trade Area within ½ mile
886
Businesses Nearby
Explore this area
Business Placement
Demographics for 11730, NY
14,523
Population
5,230
Households
2.8
Avg Household Size
43
Median Age
39%
College-Educated
95%
High-School Grad
4.5 sq mi
ZIP Area
3,227
Density / Sq Mi
$146,190
Median Household Income
$64,934
Median Earnings
$2,508
Median Rent
$577,600
Median Home Value
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Market
Vacancy Rate% for Office in Northeast region
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Frequently Asked Questions
What type of property is this?
Office building - GSD-zoned office property with public water, public sewer, and access to central air conditioning.
Where is this office building 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: 0.98‑acre GSD‑zoned office property at 55 Carleton Avenue; Expansion potential of up to 11,000 sq. ft.; Redevelopment potential for a new building of up to 17,000 sq. ft.
