Suffolk County and Brookhaven Town property record for 143 Chestnut St, Mount Sinai, NY 11766
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2 ba · 2,239 sqft · built 1986 |
| Lot Size | 1 acre (43,560 sqft) |
| Owner | 2 Trust Names on File |
| Tax Bill | $10,239 (2024) |
| Flood Zone | Zone X (minimal risk) |
| APN | 0200-209.00-03.00-004.001 |
| Primary APN | 0200-209.00-03.00-004.001 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 7 Rooms |
| Stories | 1 Story |
| Building Area | 2,239 sqft Living Area |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1986 |
|---|---|
| Effective Year Built | Effective 1986 |
| Architectural Style | Ranch |
| Exterior Material | Aluminum/Vinyl |
| Lot Area | 43,560 sqft |
| View / Lot | Waterfront |
| Heating System | Radiant |
|---|
| Account Number | 1142814 |
|---|---|
| Street Address | 143 CHESTNUT ST |
| City | MOUNT SINAI |
| State | NY |
| Zip | 11766-2330 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | OL SCHWENKE 398 35 120 S 11 N TILL |
| Legal Subdivision | SCHWENCKE O L |
| Legal Block | 9000 |
| Legal Lot Number | 300 |
| Jurisdiction | SUFFOLK NY |
| Township / Civil Division | BROOKHAVEN |
| Census Block Group | 1 |
| Census Block | 1006 |
| Census Tract | 158306 |
143 Chestnut St is owner-occupied and held in a trust.
Source: Suffolk County and Brookhaven Town records, as of August 11, 2026
| Owner of Record | 2 Trust Names on File |
|---|---|
| Mailing Address | 143 CHESTNUT ST, MOUNT SINAI, NY 11766-2330 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust, Living Trust |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Deed Names | 2 Names on Deed |
|---|---|
| Record Updated | Sep 20, 2026 |
Source: Suffolk County and Brookhaven Town assessment roll, as of August 11, 2026
| Type | Name |
|---|---|
| State | New York |
| County | Suffolk County |
| County Subdivision | Brookhaven Town |
| Unified School District | Mount Sinai Union Free School District (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2025 | $3,100 Land $360 Building $2,740 | $645,833 Land $67,925 Building $516,981 | |
| 2024 | $10,239.00 | ||
| 2023 | $3,100 Land $360 Building $2,740 | $5,741 Land $667 Building $5,074 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 143 Chestnut St in Zone X, an area of minimal flood risk, though there have been 5 flood claims nearby since 1979.
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 | 4 in force |
| Nearby Flood Claims | 5 (1979–1985) |
| Claims Outside the SFHA | 5 of 5 |
| Most Recent Claim | Sep 1985 · Hurricane Gloria |
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 risk around 143 Chestnut St is low, with 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 94% of the US · lower than 93% of New York |
|---|---|
| Wildfire Likelihood | 0.01% annual chance |
| Exposure | Direct burnable vegetation |
Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.
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 |
| 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.
Source: FCC Broadband Data Collection, based on 197 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Optimum Fiber · Cable | 8,000 / 8,000 |
| Verizon Fiber · Fixed Wireless in parts of the area | 980 / 880 |
| Starlink Satellite | 280 / 30 |
5G (outdoors only) and 4G LTE
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