18 Marion Ave, Stony Brook, NY 11790 Property Records

Suffolk County and Brookhaven Town property record for 18 Marion Ave, Stony Brook, NY 11790

Property Summary

Property Type	Single Family Home
Details	3 bd · 2 ba · 1,612 sqft · built 1952
Lot Size	0.32 acres (13,939 sqft)
Owner	2 Individual Names on File
Last Sale	$550,000 (Sep 2021)
Tax Bill	$13,904 (2024)
Deeds & Mortgages	Sep 2021 Sale & Mortgage
Flood Zone	Zone X (minimal risk)
APN	`0200-361.00-03.00-011.000`

Property Details

APN / Parcel Number

Primary APN	`0200-361.00-03.00-011.000`
Alternative APNs	`472289 361.00-03-011.000` `228936100000030110000000` `00000218490` `0000218490` `218490`

Interior

Bedrooms	3 Beds
Full Baths	2 Baths
Total Rooms	7 Rooms
Stories	1 Story
Building Area	1,612 sqft Living Area

Exterior

Year Built	Built 1952
Effective Year Built	Effective 1952
Architectural Style	Ranch
Exterior Material	Wood
Lot Area	13,939 sqft (0.32 acres)
View / Lot	Waterfront

Utilities, Heating & Cooling

Heating System	Radiant

Location & Zoning

Account Number	218490
Street Address	18 MARION AVE
City	STONY BROOK
State	NY
Zip	11790-2404
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	HULSE GARDENS 1603 40
Legal Subdivision	HULSE GARDENS
Legal Block	1000
Legal Lot Number	300
Jurisdiction	SUFFOLK NY
Township / Civil Division	BROOKHAVEN
Census Block Group	2
Census Block	2005
Census Tract	158013

Owner

18 Marion Ave is owned and occupied by two individuals who bought it in September 2021.

Source: Suffolk County and Brookhaven Town records, as of August 11, 2026

Owner of Record	2 Individual Names on File
Mailing Address	18 MARION AVE, STONY BROOK, NY 11790-2404
Occupancy	Owner Occupied
Owner Type	Individual

Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Sep 22, 2021 · Amount on File
Deed Sale	Sep 22, 2021 · Amount on File
Deed Book / Page	13121 / 56
Prior Transfer Date	Dec 9, 1998
Record Updated	Sep 20, 2026

September 2021: Deed, Transfer

Document Type	Deed
Jurisdiction	SUFFOLK NY
Recording Date	Sep 22, 2021
Property Address	18 MARION AVE, STONY BROOK, NY 11790-2404
Document Number	0131210056
Book / Page	13121 / 56
Instrument Date	Aug 6, 2021
Transaction Type	Transfer
Record Updated	Nov 2, 2021

Transaction

Amount	Amount on Record
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$0.00
Amount Accuracy	Full Amount Stated
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	37 OAKWOOD RD, HUNTINGTON, NY 11743-4220

Mortgage

Document Number	DM035642
Date	Sep 22, 2021
Instrument	DM035642

Lender

Name	UNITED NATIONS FCU
Type	Credit Union

Agreement

Type	Stand-Alone First Mortgage
Amount	Amount on Record

Tax Assessment & Valuation

Source: Suffolk County and Brookhaven Town assessment roll, as of August 11, 2026

Property Jurisdictions

Type	Name
State	New York
County	Suffolk County
County Subdivision	Brookhaven Town
Unified School District	Three Village Central School District (KG - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value	Assessed Market Value
2025		$3,240 Land $240 Building $3,000	$675,000 Land $45,283 Building $566,038
2024	$13,904.00
2023		$3,240 Land $240 Building $3,000	$6,000 Land $444 Building $5,556

Assessed value is set for property tax purposes, not a market price estimate; it is a fraction of this property's market value.

Flood

FEMA maps place 18 Marion Ave in Zone X, an area of minimal flood risk.

Source: FEMA National Flood Hazard Layer, effective September 18, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026

FEMA Flood Zone	Zone X minimal risk
Flood Insurance Requirement	Not required lenders may require it
Nearby Flood Policies	1 in force

Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.

Wildfire

Wildfire risk around 18 Marion Ave is low, with less than a 0.01% annual chance of wildfire.

Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024

Wildfire Risk	Low lower than 99.1% of the US · lower than 99.2% of New York
Wildfire Likelihood	Under 0.01% annual chance
Exposure	None beyond ember reach

Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.

Drinking Water

Source: EPA Safe Drinking Water Information System, as of September 2026

Water System	SUFFOLK COUNTY WATER AUTHORITY serves 1,100,000 people · EPA ID NY5110526
Water Source	Groundwater
Last State Inspection	Jan 2024
Lead	1 ppb (2025–2027) action level 15 ppb

Violations Reported to EPA

Water Quality	Asbestos resolved · Jul 2020
Treatment and Procedure	None last 10 years
Monitoring and Reporting	None last 3 years

Results are for the whole water system, not water tested at this address; lead at the tap also depends on the building's own pipes.

Internet Providers

Source: FCC Broadband Data Collection, based on 304 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
Optimum Fiber · Cable	8,000 / 8,000
Verizon Fixed Wireless · Fiber in parts of the area	300 / 20
T-Mobile Fixed Wireless	100 / 20