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 Market301
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
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
Listing Agency:
Marylou Swan Realty Corp
(631) 289-5550
Listed By:
Joseph E. Donaghy · License #10401392754
(631) 774-9671
Added: Oct 24, 2025
Changed: Aug 20
Last Checked: Aug 20 at 8:06AM
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.
55 Carleton Avenue is a 1975-built office property on a 0.98-acre commercial site zoned GSD. The existing improvements include brick construction with stucco and fiberglass insulation, with natural gas forced-air heating and central air cooling. The property is served by public water and public sewer, and cable is available. A chain link fence is on site.
The site sits on Carleton Avenue, described as the main thoroughfare into East Islip, with access from Sunrise Hwy and Southern State Parkway. It is located approximately two miles from the Federal Court House and about 2.5 miles from Northwell South Shore University Hospital.
The site is positioned for flexible development, with room for expansion of additional space up to 11,000 sq. ft. or redevelopment of the entire site for up to 17,000 sq. ft. of new building space for office, medical, or veterinary users.
The site sits on Carleton Avenue, described as the main thoroughfare into East Islip, with access from Sunrise Hwy and Southern State Parkway. It is located approximately two miles from the Federal Court House and about 2.5 miles from Northwell South Shore University Hospital.
The site is positioned for flexible development, with room for expansion of additional space up to 11,000 sq. ft. or redevelopment of the entire site for up to 17,000 sq. ft. of new building space for office, medical, or veterinary users.
Key Highlights
- 0.98‑acre commercial site zoned GSD
- Natural gas forced‑air heat and central air cooling
- Expansion up to 11,000 sq. ft. or redevelopment up to 17,000 sq. ft.
Property Analytics
Property Profile
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
Market
Vacancy Rate% for Office in Northeast region
Questions? Ask Rey
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Frequently Asked Questions
What type of property is this?
Office building - Zoned GSD on a 0.98-acre site with HVAC and natural gas heat, positioned for office, medical, or veterinary use.
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 commercial site zoned GSD; Natural gas forced‑air heat and central air cooling; Expansion up to 11,000 sq. ft. or redevelopment up to 17,000 sq. ft.
