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MLS ID KEY1050930Last updated Oct 18, 2026

Duplex

20 Old Route 25A

Active · Smithtown · Suffolk County, NY 11768

Asking price$1,950,000Request a Showing
Bedrooms
6 Beds
Bathrooms
5 Baths
Year built
1979
Est. monthly taxes
$3,411.83
Property gallery0 / 50
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About this home

Legal 2-family ranch on a full acre in the hamlet of Fort Salonga, Town of Smithtown. Northport mailing address (11768). Kings Park Schools. Legal 2-family layout also works as a multi-generational or mother-daughter home, with two living wings, two kitchens, and separate utility meters. This house is large, with more rooms than can be shown in the listing photos — come see it in person to get the full layout. Approximately 4,426 sq ft with 6 bedrooms, 3 full baths, and 2 half baths. Original home built 1979; extension added 2003. GAF 50-year shingles were installed on the entire house in 2003 at the same time as the addition. Hardwood flooring throughout the main house and the extension. Vaulted ceilings in both houses. Two distinct main-level living wings. Kitchen with center island opens to dining and a vaulted living area with brick fireplace and skylights. Second kitchen and living wing on the main floor. Main bath in the extension has heated flooring and a jacuzzi. Main house has three heating zones: bedrooms, living area, and basement. Central air in the main house is first floor only, with two separate zones: one for the bedrooms and one for the living area. Extension has two heating and cooling zones, one for each floor. Both oil tanks are above ground and located in the basements. Two separate basement areas. The main-house basement is partially finished with rec room and walk-out access from the garage. The extension basement is partially above grade due to the slope of the property, with full-size windows, 10-ft clearance, and a walk-out. In-ground saltwater pool added 2004 with paver patio. Pool has its own drywell so the filter can be backwashed directly into the drywell. Pool is fenced. Property is partially fenced. PVC deck connecting the two houses. Motion-sensor lighting around the exterior. Mature evergreens. Attached two-car garage and long paved driveway with its own lighting. Main house on cesspool; extension on its own septic system. Separate meters for all utilities, including water. Taxes have been grieved; decision pending.

Listing snapshot

Days on site
42 days
Listed on MLS
Sep 16, 2026
Full baths
5
Annual property tax (MLS)
$40,942
Tax year
2026
Listing brokerage
REMI Realty
MLS ID
KEY1050930
Last updated
Oct 18, 2026

General features

Property type
Duplex
Year built
1979
Garage
Yes
Garage spaces
2
Total parking
7
Parking
Driveway, Garage, Garage Door Opener
Water source
Public
Sewer
Cesspool, Septic Tank
Utilities
Cable Connected, Electricity Connected, Trash Collection Public, Water Connected

Interior features

Basement
Finished, Partial, Storage Space, Unfinished, Walk-Out Access
Heating
Oil
Cooling
Central Air
Interior
First Floor Bedroom, First Floor Full Bath, Cathedral Ceiling(s), Eat-in Kitchen, Entrance Foyer, Formal Dining, High Ceilings, High Speed Internet, Kitchen Island, Open Floorplan, Primary Bathroom, Storage, Walk Through Kitchen, Walk-In Closet(s)
Flooring
Carpet, Ceramic Tile, Hardwood
Fireplace
Yes

Exterior features

Architectural style
Exp Ranch, Ranch
Construction materials
Cedar, Frame
Exterior
Lighting, Mailbox
Private pool
No

Schools (MLS)

Elementary school
Fort Salonga Elementary School
Elementary school district
Kings Park
Middle school
William T Rogers Middle School
Middle school district
Kings Park
High school
Kings Park High School
High school district
Kings Park

School information is provided by the MLS. Confirm attendance eligibility with the school district.

Recent activity

  1. Listing updated from MLS
  2. Price changed to $1,950,000
  3. First seen on this site
  4. MLS status changed

Location

Smithtown · Suffolk County, NY 11768Show interactive map
20 Old Route 25A

Smithtown · Suffolk County, NY 11768

Google Maps directions

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