Medical Office
For Sale
$1,650,000
55 Carleton Avenue, East Islip, NY 11730
An existing commercial building with site capacity for expansion or full redevelopment.
Property Size6,100 SF
Lot Size0.98 Acres
Price / SF$270.49
Days on Market368
Property Features for 55 Carleton Avenue
General Information
Standard status
Active
Size
6,100 SF
Total Parking Spaces
18
Lot size
0.98 Acres
Property subtype
Commercial
Zoning
GSD
Site & Location
Highway Access
Yes
Road Access
Yes
Additional Details
Land Use
commercial
Taxes and HOA fees
Annual Taxes
$29,360
Building Details
Building Size
6,100 SF
Year Built
1975
Buildings
1
Stories
1
Units
8
Listing Agency:
Marylou Swan Realty Corp
(631) 289-5550
Listed By:
Joseph E. Donaghy · License #10401392754
(631) 774-9671
Source:
Croninreale
Added: Oct 24, 2025
Changed: Oct 25
Last Checked: Oct 23 at 5:02PM
Displayed information is deemed reliable but is not guaranteed and should be independently verified. All listing content including descriptions, pricing, images are the copyrighted material of Marylou Swan Realty Corp
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Review the available facts, identify missing information and prepare questions for the agent.
Investment Insights
Based on property information with market context.
At 55 Carleton Avenue, the property includes a 6,100-square-foot building on 0.98 acres. The site offers the option to add up to 11,000 square feet or redevelop for a building of up to 17,000 square feet. The stated zoning designation is GSD, and the property is presented for office, medical, or veterinary use.
Carleton Avenue serves as a main route into East Islip. The site is 2 miles from the Federal Courthouse and 2.5 miles from Northwell South Shore University Hospital, with access from Sunrise Highway and the Southern State Parkway.
Carleton Avenue serves as a main route into East Islip. The site is 2 miles from the Federal Courthouse and 2.5 miles from Northwell South Shore University Hospital, with access from Sunrise Highway and the Southern State Parkway.
Key Highlights
- 6,100‑square‑foot building on 0.98 acres
- Potential to add up to 11,000 square feet
- Full‑site redevelopment option for up to 17,000 square feet
Financial Insights
Estimated NOI and Cap Rate
NOI / Yr
$104,892
Cap Rate
6.36%
Suggested Prices Based on Cap Rates
Cap Rate 5%
$2,097,840
$2.1M
Cap Rate 7%
$1,498,457
$1.5M
Cap Rate 9%
$1,165,467
$1.2M
Market Conditions
NOI Build-Up for 6,100 SF
Gross rent
$170.6K $27.96/SF
− Vacancy
−$30.7K −$5.03/SF
EGI
$139.9K $22.93/SF
− OpEx
−$35.0K −$5.73/SF
NOI
$104.9K $17.20/SF
Area
Suffolk County, NY
Vacancy
18.00%
Lease Rate
$27.96 /SF/Yr
Expense Ratio
25.00%
Simulate Cap Rate and NOI
Suggested Prices Based on Cap Rates
Cap Rate 5%
$2,097,840
Cap Rate 7%
$1,498,457
Cap Rate 9%
$1,165,467
Alternative Uses
Best Use
Office B
$1.50M
$1.31M – $1.75M
NOI $104,892 @ 7.0% cap · market cap 6.36%
Second Best
Healthcare Medical
$1.39M
$1.22M – $1.63M
NOI $97,563 @ 7.0% cap · market cap 5.91%
Theoretical Best
Office A
$1.86M
$1.63M – $2.17M
NOI $130,084 @ 7.0% cap · market cap 7.88%
Zoning and permitted uses should be independently verified with authorities.
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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
Under-served
Demand for This Use
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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Cap Rate, Value Estimation, Potential NOI and more
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Market
Vacancy Rate% for Office in Northeast region
Similar Off Market Nearby
- All Friends Veterinary Hospital — 84 E Main St, East Islip, NY 11730
Frequently Asked Questions
What type of property is this?
Medical Office Space - An existing commercial building with site capacity for expansion or full redevelopment.
Where is this medical 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: 6,100‑square‑foot building on 0.98 acres; Potential to add up to 11,000 square feet; Full‑site redevelopment option for up to 17,000 square feet
