Westchester County and Mamaroneck Town property record for 903 Old Post Rd, Mamaroneck, NY 10543
| Property Type | Triplex |
|---|---|
| Details | 6 bd · 4 ba · 3,751 sqft · built 1880 |
| Lot Size | 0.19 acres (8,276 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $450,000 (Mar 2003) |
| Tax Bill | $23,083 (2026) |
| Flood Zone | Zone X (minimal risk) |
| APN | 553203 9-20-20 |
| Primary APN | 553203 9-20-20 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 6 Beds |
|---|---|
| Full Baths | 4 Baths |
| Stories | 2 Stories |
| Building Area | 3,751 sqft Total Area |
| 1st Floor Area | 1,782 sqft |
| 2nd Floor Area | 1,474 sqft |
| Upper Floors Area | 495 sqft |
| Year Built | Built 1880 |
|---|---|
| Effective Year Built | Effective 1880 |
| Architectural Style | Colonial |
| Exterior Material | Aluminum/Vinyl |
| Lot Area | 8,276 sqft (0.19 acres) |
| Lot Dimensions | 90 ft deep x 92 ft wide |
| Garage Type | Basement |
| Patio Area | 480 sqft |
| Cooling System | Central |
|---|---|
| Heating System | Hot Water |
| Heating Fuel | Oil |
| Sewer | Municipal |
| Water Source | Commercial |
| Account Number | 663500 |
|---|---|
| Street Address | 903 OLD POST RD |
| City | MAMARONECK |
| State | NY |
| Zip | 10543-3931 |
| Property Category | Residential |
| Property Type | Residential > Multi-Unit > Triplex |
| Local Zoning Code | R-5 |
| Legal Block | 20 |
| Jurisdiction | WESTCHESTER NY |
| Township / Civil Division | MAMARONECK |
| Census Block Group | 4 |
| Census Block | 4007 |
| Census Tract | 7200 |
903 Old Post Rd, a triplex, is owned and occupied by two individuals who bought it in March 2003.
Source: Westchester County and Mamaroneck Town records, as of October 21, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 903 OLD POST RD, MAMARONECK, NY 10543-3931 |
| 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.
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Mar 17, 2003 · Amount on File |
| Deed Sale | Mar 17, 2003 · Amount on File |
| Deed Document Number | 2003430670526 |
| Record Updated | Oct 29, 2026 |
The 2026 property tax bill for 903 Old Post Rd was $23,083 with exemptions applied, up 28.5% from the year before.
Source: Westchester County and Mamaroneck Town assessment roll, as of May 14, 2026
| Type | Name |
|---|---|
| State | New York |
| County | Westchester County |
| County Subdivision | Mamaroneck Town |
| Municipality | Mamaroneck Village |
| Unified School District | Mamaroneck Union Free School District (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $23,083.00 (+28.45%) Homeowner's exemption Veteran's exemption | ||
| 2025 | $17,970.00 | $1,187,000 (+3.04%) Land $420,000 Building $767,000 | $1,187,000 (+3.04%) Land $420,000 Building $767,000 |
| 2024 | Homeowner's exemption Veteran's exemption Additional exemption filed | $1,152,000 (+7.97%) Land $420,000 Building $732,000 | $1,152,000 (+7.97%) Land $420,000 Building $732,000 |
| 2023 | $1,067,000 Land $420,000 Building $647,000 | $1,067,000 Land $420,000 Building $647,000 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 903 Old Post Rd in Zone X, an area of minimal flood risk, though there have been 172 flood claims nearby since 1978.
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 |
| Flood Insurance Cost | Premium on File median of 106 policies |
| Community Rating System | Class 8 (10% premium discount) |
| Nearby Flood Policies | 106 in force |
| Nearby Flood Claims | 172 (1978–2023) |
| Claims Outside the SFHA | 38 of 172 |
| Most Recent Claim | Sep 2023 · Severe Storm And Flooding |
| Claims by Event |
|
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 903 Old Post Rd 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.
Source: EPA Safe Drinking Water Information System, as of September 2026
| Water System | WESTCHESTER JOINT WATER WORKS serves 59,629 people · EPA ID NY5903435 |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Mar 2025 |
| Lead | 3 ppb (2026–2028) action level 15 ppb |
| Water Quality | Failure to filter currently in violation since Jun 1993 Haloacetic acids resolved · Jul 2019 |
|---|---|
| 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 347 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 |
| T-Mobile Fixed Wireless | 100 / 20 |
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