Westchester County and Rye Town property record for 311 E Boston Post Rd, Mamaroneck, NY 10543
| Property Type | Harbor & Marine Transportation |
|---|---|
| Details | 73,125 sqft · built 1890 |
| Lot Size | 1.98 acres (86,327 sqft) |
| Owner | Company Name on File |
| Tax Bill | $131,754 (2026) |
| Flood Zone | Zone X (moderate risk) |
| APN | 554803 154.58-1-17 |
| Primary APN | 554803 154.58-1-17 |
|---|---|
| Alternative APNs |
|
| Stories | 2 Stories |
|---|---|
| Building Area | 73,125 sqft Gross Area |
| Basement Area | 3,018 sqft |
| Unfinished Basement | 3,018 sqft |
| Year Built | Built 1890 |
|---|---|
| Effective Year Built | Effective 1978 |
| Lot Area | 86,327 sqft (1.98 acres) |
| View / Lot | Waterfront |
| Porch | Covered Porch |
|---|---|
| Porch Area | 155 sqft |
| Canopy | 1,386 sqft |
| Loading Dock | 20,000 sqft |
| Boat Access | Boat Access |
| Total Buildings | 2 Buildings |
| Cooling System | Partial |
|---|---|
| Heating Fuel | Oil |
| Sewer | Municipal |
| Water Source | Commercial |
| Account Number | 00006812000 |
|---|---|
| Street Address | 311 E BOSTON POST RD |
| City | MAMARONECK |
| State | NY |
| Zip | 10543-3738 |
| Property Category | Public Works |
| Property Type | Public Works > Harbor & Marine Transportation |
| Local Zoning Code | MC-2 COMM |
| Legal Block | 1 |
| Legal Lot Number | 17.000 |
| Jurisdiction | WESTCHESTER NY |
| Township / Civil Division | RYE |
| Census Block Group | 1 |
| Census Block | 1000 |
| Census Tract | 7402 |
311 E Boston Post Rd, a public works property, is owned by a company.
Source: Westchester County and Rye Town records, as of October 21, 2026
| Owner of Record | Company Name on File |
|---|---|
| Mailing Address | 311 E BOSTON POST RD, MAMARONECK, NY 10543-3738 |
| Owner Type | Company |
| Vesting | Company |
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 | Name on Deed |
|---|---|
| Record Updated | Oct 29, 2026 |
The 2026 property tax bill for 311 E Boston Post Rd was $131,754, up 47.4% from the year before.
Source: Westchester County and Rye Town assessment roll, as of May 14, 2026
| Type | Name |
|---|---|
| State | New York |
| County | Westchester County |
| County Subdivision | Rye Town |
| Municipality | Mamaroneck Village |
| Unified School District | Rye Neck Union Free School District (KG - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $131,754.00 (+47.38%) | ||
| 2025 | $89,400.00 | $5,000,000 (-) Land $1,720,000 Building $3,280,000 | $5,000,000 (-) Land $1,720,000 Building $3,280,000 |
| 2024 | $5,000,000 (-) Land $1,720,000 Building $3,280,000 | $5,000,000 (-) Land $1,720,000 Building $3,280,000 | |
| 2023 | $5,000,000 Land $1,720,000 Building $3,280,000 | $5,000,000 Land $1,720,000 Building $3,280,000 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 311 E Boston Post Rd in Zone X, an area of moderate flood risk, within 100 ft of a high-risk flood zone.
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 moderate risk |
|---|---|
| 500-Year Floodplain | Yes 0.2% annual chance |
| Nearest Special Flood Hazard Area | Zone AE, within 100 ft |
| Flood Insurance Requirement | Not required lenders may require it |
| Flood Insurance Cost | Premium on File median of 35 policies |
| Community Rating System | Class 8 (10% premium discount) |
| Nearby Flood Policies | 35 in force |
| Nearby Flood Claims | 50 (1979–2024) |
| Claims Outside the SFHA | 10 of 50 |
| Most Recent Claim | Jan 2024 · other causes |
| 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.
The area around 311 E Boston Post Rd has no burnable land within ember reach, so its wildfire risk is not rated.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Not rated no burnable land within 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 334 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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