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MLS ID KEY928396Last updated Oct 21, 2026

Office

55 Carleton Avenue

Active · Islip · Suffolk County, NY 11730

Asking price$1,650,000Request a Showing
Year built
1975
Est. monthly taxes
$2,446.7
Property gallery0 / 15
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About this home

55 Carleton Avenue presents a rare chance to acquire a high-visibility, 0.98-acre commercial property on Carleton Avenue—the main thoroughfare into East Islip. Zoned GSD, this site is ideally suited for office, medical, or veterinary use, offering exceptional exposure and accessibility. This unique opportunity allows for expansion of additional space of up to 11,000 sq. ft. or redevelop the entire site for your new building up to 17,000 ft. sq. Only two miles from the Federal Court House and 2.5 miles from Northwell South Shore University Hospital with easy access from Sunrise Hwy and Southern State Parkway. The East Islip area boasts strong commercial activity and highly desirable demographics, making this a prime location for professional services seeking long-term growth and visibility.

Listing snapshot

Days on site
59 days
Listed on MLS
Oct 24, 2025
Annual property tax (MLS)
$29,360.36
Tax year
2025
Listing brokerage
Marylou Swan Realty Corp
MLS ID
KEY928396
Last updated
Oct 21, 2026

General features

Property type
Office
Year built
1975
Stories
1
Total parking
18
Water source
Public
Sewer
Public Sewer
Utilities
Cable Available, Cable Connected, Electricity Connected, Natural Gas Connected, Phone Connected, Sewer Connected, Trash Collection Private, Water Connected

Interior features

Basement
Bilco Door(s), Unfinished
Heating
Forced Air, Natural Gas
Cooling
Central Air, Ductwork
Appliances
None
Flooring
Combination

Exterior features

Construction materials
Brick, Fiberglass Insulation, Stucco

Recent activity

  1. Listing updated from MLS
  2. First seen on this site
  3. MLS status changed

Location

Islip · Suffolk County, NY 11730Show interactive map
55 Carleton Avenue

Islip · Suffolk County, NY 11730

Google Maps directions

Listing data is supplied by the MLS and may change without notice.