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647 Union Avenue

Holtsville, NY 11742

4 beds
3 baths
1,904 sqft
~3/4 acre lot
$288 per sqft
1955 build
– on site

Welcome to 647 Union Ave — As per Town of Brookhaven - Planning & Environmental, this property is zoned L1 Industrial, perfect for Landscapers, contractors or Nature lovers! This beautifully maintained 4-bedroom, 2.5-bath residence is nestled on an oversized corner lot spanning over half an acre with so many possibilities with the location and oversized driveway. This unique home offers a spacious and flexible layout perfect for both everyday living and entertaining. The main level features two generously sized bedrooms, including the primary bedroom, a full bath, and a large eat-in kitchen complete with stainless steel appliances and dining area. Upstairs, you'll find additional bedrooms — one of which offers the option to be used as a den — and opens to a private terrace for your morning coffee or evening unwind. The fully finished basement has a den, full bathroom, laundry area, utilities, storage, and a private outside entrance. Outside you’ll be captivated by the lush, professionally landscaped gardens, complete with walkways that meander around colorful blooms and greenery. Whether you're entertaining poolside, relaxing on the terrace, or enjoying the tranquility of the garden, the outdoor space is truly a private retreat. The property also features an above-ground pool, an extended driveway with ample parking. With incredibly low taxes just over $7,000, and a Land Use designation of Commercial Lot per public records, this property presents both residential charm and exciting potential. Don’t miss this rare opportunity to own a home that offers space, beauty, and versatility — both inside and out!

Listing courtesy of ONEKEY / Douglas Elliman Real Estate

Last checked: Checking… • Last updated Jul 13, 2025 •

MLS# 887130 —

The Building

Year Built:

1955
Basement:

true
Architectural Style:

Exp Cape
Construction Materials:

Brick, Frame
Patio And Porch Features:

Terrace
Building Area Units:

Square Feet
Building Area Total:

1904
Laundry Features:

In Basement
Attic:

Partial

Interior

Levels:

Two
Living Area:

1904
Total Rooms:

9
Interior Features:

First Floor Bedroom, Eat-in Kitchen, Master Downstairs
Fireplace:

false
Flooring:

Wood
Living Area Source:

Public Records
# of Kitchens:

1

Financial & Terms

Lease Considered:

false

The Property

Lot Features:

Corner Lot
Lot Size Acres:

0.68
Parcel Number:

0200-766-00-02-00-008-000
Property Type:

Residential
Property Subtype:

Single Family Residence
Lot Size SqFt:

29,621 Sqft
Property Attached:

false
Waterfront:

false

Listing Agent

Contact info:

Taxes

Tax Year:

2025
Tax Source:

Municipality
Tax Annual Amount:

7203.29

Beds

Total Bedrooms:

4

Baths

Full Baths:

2
Half Baths:

1
Total Baths:

3

The Listing

Special Listing Conditions:

None
Virtual Tour URL Unbranded:

Virtual Tour

Heating & Cooling

Heating:

Baseboard, Oil
Cooling:

Wall/Window Unit(s)
# of Heating Zones:

2

Utilities

Sewer:

Cesspool
Utilities:

Electricity Connected, Water Connected
Water Source:

Public

Appliances

Appliances:

Dryer, Range, Refrigerator, Stainless Steel Appliance(s), Washer

Schools

High School:

Sachem High School East
Elementary School:

Chippewa Elementary School
High School District:

Sachem
Middle School:

Sagamore Middle School
Elementary School District:

Sachem
Middle School District:

Sachem

The Community

Association:

false
Senior Community:

false
Pool Features:

Above Ground
Pool Private:

true

Parking

Garage:

true
Garage Spaces:

1
Carport:

false

Monthly cost estimate

Asking price

$549,990

Expense	Monthly cost
Mortgage	$2,945
Taxes	$600
Insurance	$151
Utilities	$400 See report
Total	$4,096/mo.^*
	^*This is an estimate

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Optimum

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Sale history

Date	Event	Source	Price	% Change
7/9/25 Jul 9, 2025	Listed / Active	ONEKEY	$549,990

65% of nearby similar homes sold for over asking price

Similar homes that sold in bidding wars went $30k above asking price on average, but some went as high as $101k over asking price.

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This house located in Holtsville, NY 11742 is currently for sale for $549,990. 647 Union Avenue is a 1,904 square foot house with 4 beds and 3 baths that has been on Estately for 5 days. This house is in the attendance area of Sagamore Middle School, Sachem East High School, and Chippewa Elementary School.

Listing Courtesy of: ONEKEY and Douglas Elliman Real Estate.

IDX information is provided exclusively for consumers’ personal non-commercial use. It may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Data is deemed reliable but is not guaranteed accurate by the MLS.

Based on information submitted to the MLS GRID. 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.