21 Bay 3rd Street, Islip, NY 11751
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Property image
FOR SALE
NEW
OPEN SUN, 12-2PM

21 Bay 3rd Street
Islip, NY 11751

  • 2 Beds
  • 1 Bath
  • 1,188 sqft

$599,995

Est. Mortgage $3,977/mo*
Get Pre-Qualified

$599,995

Est. Mortgage $3,977/mo*
Get Pre-Qualified
2 Beds
1 Bath
1,188 sqft

Home Highlights

Parking
Garage
Climate Control
Heating & Cooling
Price/Sqft
$505
Listed
Less than a day ago

Local Information

  • Map ViewExplore the area around 21 Bay 3rd Street.
  • Schools3 Elementary Schools1 Middle School1 High School
  • Shop & Eat
-- mins to
Commute Destination

About this House

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.

Open House

Sunday, August 09
12:00 PM to 2:00 PM
Last check for updates: about 4 hours ago
Listing by: Netter Real Estate Inc, (631) 661-5100
Steven J. Rainone CBR SRES, (631) 661-5100
Netter Real Estate Inc, (631) 661-5100
Maryann Rainone, (631) 553-0263
Source: OneKey® MLS as distributed by MLS GRID, MLS#1023939
Also Listed on OneKey® MLS as distributed by MLS GRID.

Home Details for 21 Bay 3rd Street

Interior Features

Interior Details
Basement: Full,Partially FinishedNumber of Rooms: 6
Beds & Baths
Number of Bedrooms: 2Number of Bathrooms: 1Number of Bathrooms (full): 1
Dimensions and Layout
Living Area: 1188 Square Feet
Appliances & Utilities
Utilities: Electricity Connected, Natural Gas Connected, Sewer Available, Trash Collection Public, Water ConnectedAppliances: Convection Oven, Cooktop, Dryer, Gas Cooktop, Gas Oven, Oven, Range, Refrigerator, Washer, Gas Water HeaterDryerLaundry: Washer/Dryer Hookup,Gas Dryer Hookup,In Basement,Inside,Laundry Room,Washer HookupRefrigeratorWasher
Heating & Cooling
Heating: Hot Water,Natural Gas,SteamHas CoolingAir Conditioning: DuctlessHas HeatingHeating Fuel: Hot Water
Fireplace & Spa
No FireplaceNo Spa
Gas & Electric
Has Electric on Property
Windows, Doors, Floors & Walls
Flooring: Wood
Levels, Entrance, & Accessibility
Levels: TwoFloors: Wood

Exterior Features

Exterior Home Features
Foundation: Concrete PerimeterNo Private Pool
Parking & Garage
Number of Garage Spaces: 1Number of Covered Spaces: 1No CarportHas a GarageHas Open ParkingParking Spaces: 1Parking: Detached,Driveway,Garage,Off Street
Frontage
Road Frontage: Municipal
Water & Sewer
Sewer: Public Sewer
Farm & Range
Not Allowed to Raise Horses

Days on Market

Days on Market: <1 day on Trulia

Property Information

Year Built
Year Built: 1929Year Renovated: 2021
Property Type / Style
Property Type: ResidentialProperty Subtype: Single Family Residence, ResidentialArchitecture: Cape Cod
Building
Construction Materials: FrameNot Attached Property
Property Information
Condition: ActualParcel Number: 0500397000200017000

Price & Status

Price
List Price: $599,995Price Per Sqft: $505

Active Status

MLS Status: Active

Location

Direction & Address
City: IslipCommunity: St. Marks
School Information
Elementary School: Maud S Sherwood Elementary SchoolJr High / Middle School: Islip Middle SchoolHigh School: Islip High SchoolHigh School District: Islip

Agent Information

Listing Agent
Listing ID: 1023939

Building

Building Area
Building Area: 1436 Square Feet

Community

Not Senior Community

HOA

No HOA

Lot Information

Lot Area: 6098 sqft

Listing Info

Special Conditions: None

Offer

Listing Agreement Type: Exclusive Right To Sell

Miscellaneous

BasementMls Number: 1023939Attic: NoneAttribution Contact: 631-661-5100Showing Requirements: Appointment Only, Call Listing Office, Occupied

Market trends in Islip

Last updated June 2026
Buyer'sMarketSeller'sMarket
Avg. sale price
—
Sale-to-List Price
—
Price per sq ft
—
Available listings
42
4MoM

Price History for 21 Bay 3rd Street

DatePriceEventSource
08/06/2026$599,995Listed For SaleOneKey® MLS as distributed by MLS GRID #1023939
02/07/2022$450,000Sold
N/A
12/24/2021$450,000Sold
OneKey® MLS as distributed by MLS GRID #L3321587
09/30/2021$449,999PendingOneKey® MLS as distributed by MLS GRID #3321587
08/24/2021$449,999Listed For SaleOneKey® MLS as distributed by MLS GRID #3321587
08/16/2021ListingRemovedOneKey® MLS as distributed by MLS GRID #3321587
07/07/2021$479,000PriceChange
OneKey® MLS as distributed by MLS GRID #3321587
06/15/2021$499,000Listed For SaleOneKey® MLS as distributed by MLS GRID #3321587

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Property Tax and Assessment

Year2025
Tax
Assessment$29,650
Home facts updated by county records

Comparable Sales for 21 Bay 3rd Street

Address
Distance
Property Type
Sold Price
Sold Date
Bed
Bath
Sqft
191 Smith Avenue, Islip, NY
0.30
Single-Family Home
$633,500
04/09/26
2
1
1,112
24 Bay 3rd, Islip, NY
0.37
Single-Family Home
$595,000
05/27/26
3
1
1,176
149 Union Avenue, Islip, NY
0.15
Single-Family Home
$685,000
05/04/26
3
1
1,539
61 Maple Street, Islip, NY
0.53
Single-Family Home
$685,000
08/14/25
2
1
1,498
39 Shebar Drive, Islip, NY
0.07
Single-Family Home
$855,000
07/28/26
3
2
1,900
96 Pardee Avenue, Islip, NY
0.75
Single-Family Home
$480,000
01/21/26
3
1
1,236
57 Wave Crest Drive, Islip, NY
0.19
Single-Family Home
$765,000
03/27/26
4
1.5
1,358
34 Shebar Drive, Islip, NY
0.03
Single-Family Home
$90,000
03/23/26
3
2
1,348
110 Saint Marks Lane, Islip, NY
0.09
Single-Family Home
$750,000
12/22/25
3
2
2,628
155 Smith Avenue, Islip, NY
0.30
Single-Family Home
$690,000
07/22/26
4
2
2,100

Nearby homes

Get a sense of prices in the area by checking nearby homes.
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Assigned Schools

These are the assigned schools for 21 Bay 3rd Street.
View nearby schools on GreatSchools
The GreatSchools Rating compares schools on a variety of school quality indicators including test scores, college readiness, equity and more. Learn more.

What Locals Say about Islip

At least 118 Trulia users voted on each feature.

  • 90 % Say parking is easy

  • 90 % Say it's dog friendly

  • 88 % Say car is needed

  • 86 % Say there's holiday spirit

  • 85 % Say yards are well-kept

  • 75 % Say people would walk alone at night

  • 73 % Say kids play outside

  • 65 % Say neighbors are friendly

  • 64 % Say it's quiet

  • 63 % Say it's walkable to restaurants

  • 62 % Say streets are well-lit

  • 62 % Say they plan to stay for at least 5 years

  • 59 % Say there are sidewalks

  • 59 % Say it's walkable to grocery stores

  • 59 % Say there's wildlife

  • 49 % Say there are community events

Sourced by Trulia users. Learn more about our methodology.
  • Michellereid2323
    "Family-oriented neighborhood. Main Street is charming, walkable, and dotted with boutiques, cafes, and diners."
    0
    Flag
  • Matt Classie
    "Street fairs, events at Brookwood Hall during holidays. Theres lots to do in the town of Islip. Bats & Brews is a great event."
    0
    Flag
  • Yen160107
    "I have kids that play in the front yard and they step on the dog feces that they left behind. Also I have signs that say “kids at play” but they do not care"
    0
    Flag
  • Trulia User
    "The drive is horrible and the traffic which is 300 feet from your front door is deafening! A ten lane super hwy and that’s what you wake up to at 4:30 am every day ! Or you can take the train a mile away which you can also here every morning blasting it’s way to islip train station . "
    0
    Flag
  • Trulia User
    "Well celebrate almost all the events soccer games good school very friendly neighborhoods good shopping center "
    1
    Flag
  • Jamal G.
    "this neighborhood is a great place to live there are restaurants in the mall nearby good schools and they are also close"
    14
    Flag
  • Stephen B.
    "The taxes are very high here for the school. Bay Shore schools are just as good or better and the taxes are much lower. "
    9
    Flag
  • Michael .
    "Good! I work in the city and take the LIRR. The islip station has free parking and plenty of spaces."
    1
    Flag
  • Monmona
    "you need to have a car to commute around. around. if you live close enough to the Long Island Railroad, then you can walk to the station and take the train from there."
    1
    Flag
  • Fldsetter
    "I grew up here and actually bought my childhood home back after living in another part of the country . Beaches are close , most folks keep there homes well maintained . There are lot of children here and the schools are second to none . I wish the town would replace the roads here , and take better care of there pubic areas ! But let the young folks moving in fight that fight ! "
    1
    Flag
  • Djhafner132
    "5 min to train station.the neighbors are friendly.i am an avid fisherman and two fishing piers are less than a mile away.the streets are well treed and maintained "
    0
    Flag
  • Djhafner132
    "I lived here since 1973.The homes are well kept and neighbors are friendly.the town dock is an easy walk with great fishing the streets are well maintained.All in all a great place to live"
    0
    Flag
  • Djhafner132
    "Parades block parties great fishing close by.great south of montauk location.Great place to raise a family "
    0
    Flag
  • Ricktssf
    "I work locally, so I can walk to work. the train station to NYC is only 4 blocks away. easy commute on the train. "
    2
    Flag
  • G.Greco
    "I've made Islip my home since 1980. Yards are well kept, the streets are maintained, paved and cleaned regularly. The school district is good. It's a good place to live and raise a family. This area south of Montauk is very desirable"
    16
    Flag
  • Tannuramees
    "parades, fairs, shops close by, farmers market, good schools, nice neighborhood, school events, town events"
    1
    Flag
  • Catherine M.
    "I have lived here for 18 years and for the most part it’s a good area. I am not a huge fan of the school district but it’s not horrible either ."
    11
    Flag
  • Stefbartoli
    "Dog friendly neighborhood! People walk their dogs around regularly. Neighbors look out for each other’s pets as well. "
    1
    Flag
  • Tyase930
    "Quiet respectful neighbors. Walking distance to stores. Lots of new businesses and new development s."
    0
    Flag
  • Tony H.
    "I live in this neighborhood for 2 years so far people are very friendly, there's always parking, people walk their dogs at night and exercise regularly. It's pretty cool !!!"
    0
    Flag
  • Fldsetter
    "Crappy roads / rats / compact floresant lights instead of LED ( someone got paid off ) no trees left due to disease , and the town is not planting any ! Highway noise 10 lanes now on Sunrise HWY - RT27 . No plans for a sound wall ??? I guess we are lower class here in Islip . Airplane and helicopters all day and night fly over head ,, isn’t there a bay or ocean they can fly over then go straight up Lakeland Blvd to the airport ???? I will eave as soon as I find a house elsewhere and not in NY "
    0
    Flag
  • Ricktssf
    "I'm 17 years living in Islip. a little great Hamlet along the great South Bay. Town of Islip is much larger, but this is a Suburban area. "
    0
    Flag

LGBTQ Local Legal Protections

Steven J. Rainone CBR SRES, Netter Real Estate Inc, (631) 661-5100
Agent Phone: (631) 661-5100
Based on information submitted to the MLS GRID as of 2026-08-06 12:18:09 PDT All data is obtained from various sources and may not have been verified by broker or MLS GRID. Supplied Open House Information is subject to change without notice. All information should be independently reviewed and verified for accuracy. Properties may or may not be listed by the office/agent presenting the information. Some IDX listings have been excluded from this website. Click here for more information
21 Bay 3rd Street, Islip, NY 11751 is a 2 bedroom, 1 bathroom, 1,188 sqft single-family home built in 1929. This property is currently available for sale and was listed by OneKey® MLS as distributed by MLS GRID on Aug 6, 2026. The MLS # for this home is MLS# 1023939.