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$599,995

  • For Sale
  • Active
  • Single Family
  • 2 Beds
  • 1 Full Bath
  • 1,436 Sq. Ft.
  • 1 Car Garage
See This Home
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See This Home
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Welcome to this charming 1930 Cape Cod located mid-block in the desirable St. Marks neighborhood south of Montauk Highway. Filled with character and thoughtful updates, this home features original built-ins in the kitchen, dining room, and primary bedroom, hardwood floors in the living and dining room, and a beautifully renovated bathroom with classic octagon ceramic tile. Four energy-efficient split units provide heating and air conditioning, complemented by smart thermostats, a new gas heating system, separate hot water heater, and 200-amp electric service. Flexible bonus spaces offer the perfect home office and playroom/Den. Enjoy front and rear in-ground sprinklers, low taxes, and an unbeatable location just minutes from Islip Beach, the marina, parks, shopping, restaurants, and the Long Island Railroad. A wonderful opportunity to own a home that blends timeless charm with today's modern conveniences.

Full Property Details for 21 Bay 3rd St

General

  • Price: $599,995
  • Taxes: $10,711
  • Status: Active
  • Type: Single Family
  • Source: Long_Island
  • MLS ID: 1023939
  • Updated: 8/6/2026
  • Added to Site: 22 day(s) ago

Interior

  • Number of Rooms: 6
  • Interior Features: First Floor Full Bath, Entrance Foyer, Formal Dining, Galley Type Kitchen, Low Flow Plumbing Fixtures, Original Details, Washer/Dryer Hookup
  • Appliances: Convection Oven, Cooktop, Dryer, Gas Cooktop, Gas Oven, Oven, Range, Refrigerator, Washer, Gas Water Heater
  • Laundry Facilities: Yes
  • Flooring: Wood

Rooms

Bathrooms

  • Total Bathrooms: 1
  • Full Bathrooms: 1

Bedrooms

  • Total Bedrooms: 2

Other Rooms

  • Laundry: Gas Dryer Hookup, In Basement, Inside, Laundry Room, Washer Hookup

Parking

  • Garage: Yes
  • Garage Spaces: 1
  • Parking Features: Detached, Driveway, Garage, Off Street

Location

  • County: Suffolk County
  • Subdivision: St. Marks
  • Cross Streets: South Bay Avenue
  • Direction Faces: South

School Information

  • High School District: Islip
  • Elementary School: Maud S Sherwood Elementary School
  • Middle School: Islip Middle School
  • High School: Islip High School

Heating & Cooling

  • Cooling Type: Ductless
  • Heating Type: Hot Water, Natural Gas, Steam
  • Heating Zones: 2

Utilities

  • Sewer: Public Sewer
  • Water: Public
  • Utility Description: Electricity Connected, Natural Gas Connected, Sewer Available, Trash Collection Public, Water Connected

Structural Information

  • Architectural Style: Cape Cod
  • Detached/Attached: Detached
  • Construction: Frame
  • Basement: Yes
  • Basement Desc.: Full Basement, Partially Finished
  • Building Size: 1436
  • Square Feet: 1,436
  • Sq. Ft. Source: Public Records
  • Year Built: 1929

Lot Features

  • Lot Size (Acres): 0.146
  • Lot Size (Sq. Ft.): 6,098
  • Lot Dimensions: 60 x 106
  • Frontage: Municipal
  • Lot Features: Back Yard, Front Yard

Financial Considerations

  • Taxes Include: Sewer, Trash
  • Tax Amount: $10,711

Disclosures and Reports

  • Special Conditions: None
  • Property ID: 0500-397-00-02-00-017-000
  • Block: 2
  • Lot Number: 17

Listed by Netter Real Estate Inc and James A Netter Real Estate Inc

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Listing agents

— 21 Bay 3rd St —

  • Netter Real Estate Inc

  • James A Netter Real Estate Inc

631-661-5100

Get Pre-Approved Today

Be ready to buy your new home!

with our affiliated lender
NMLS#: 1598647

Get Pre-Approved

Be ready to buy your new home!

with our affiliated lender
NMLS#: 1598647

Get Pre-Approved

Schools serving 21 Bay 3rd St

School District:Islip Union Free School District
NameGradesDistance
Maud S Sherwood Elementary School
301 Smith Avenue, Islip, NY 11751
2-50.4 mi
Wing Elementary School
1 Winganhauppauge Road, Islip, NY 11751
K-11.2 mi
Commack Road Elementary School
300 Commack Road, Islip, NY 11751
2-51.6 mi
Islip Middle School
211 Main Street, Islip, NY 11751
7-80.8 mi
Disclaimer: School attendance boundaries provided by ATTOM Data Solutions and are for reference only. Contact the school directly to verify enrollment eligibility.

Price & Sales History for 21 Bay 3rd St Get Price Alerts and Save Property

Date
Details
Price
Change
Source
8/06/2026
Listed
$599,995
33.33%
MLS
12/22/2021
Sold
$450,000
—
Public Record
Get Price Alerts and Save Property
Disclaimer: Historical sales information is derived from public records provided by the county offices. Information is not guaranteed and should be independently verified.

Tax History for 21 Bay 3rd St

Year
Property Taxes
Change
Tax Assessment
Change
2024
$10,112
100%
$29,650
—
2020
100%
$29,650
—
2022
-100%
$29,650
—
2016
$8,016
32%
$29,650
—
2017
$6,082
—
$29,650
—
2016
$6,082
—
$29,650
—
2015
$6,109
-18%
$29,650
—
2015
$7,472
21%
$29,650
—
2014
$6,200
4%
$29,650
—
2013
$5,946
—
$29,650
—
Disclaimer: Historical tax information is derived from public records provided by the county offices. Information is not guaranteed and should be independently verified.

Estimate the Cost for 21 Bay 3rd St

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*These costs are estimates, and the interest rates assume exceptional credit standing.

Listed by Netter Real Estate Inc and James A Netter Real Estate Inc

21 Bay 3rd Street, Islip, NY 11751 (MLS# 1023939) is a Single Family property with 2 bedrooms and 1 full bathroom. 21 Bay 3rd Street is currently listed for $599,995 and was received on August 06, 2026. Want to learn more about 21 Bay 3rd Street? Do you have questions about finding other Single Family real estate for sale in Islip? You can browse all Islip real estate or contact a Coldwell Banker agent to request more information.

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