Westchester County and Mount Vernon City property record for 40 William St, Mount Vernon, NY 10552
| Property Type | Duplex |
|---|---|
| Lot Size | 0.07 acres (3,049 sqft) |
| Owner | 2 Individual Names on Record |
| Last Sale | $200,000 (Aug 2006) |
| Tax Bill | $13,234 (2026) |
| Flood Zone | Zone X (minimal risk) |
| APN | 550800 165.38-1048-28 |
| Primary APN | 550800 165.38-1048-28 |
|---|---|
| Alternative APNs |
|
| Architectural Style | Duplex Single |
|---|---|
| Lot Area | 3,049 sqft (0.07 acres) |
| Sewer | Municipal |
|---|---|
| Water Source | Commercial |
| Account Number | 006790 |
|---|---|
| Street Address | 40 WILLIAM ST |
| City | MOUNT VERNON |
| State | NY |
| Zip | 10552-2809 |
| Property Category | Residential |
| Property Type | Residential > Multi-Unit > Duplex |
| Legal Block | 1048 |
| Legal Lot Number | 28.000 |
| Jurisdiction | WESTCHESTER NY |
| Township / Civil Division | MOUNT VERNON |
| Census Block Group | 1 |
| Census Block | 1004 |
| Census Tract | 3800 |
Source: Westchester County and Mount Vernon City records, as of October 21, 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | 2 Individual Names on Record |
|---|---|
| Mailing Address | 40 WILLIAM ST, MOUNT VERNON, NY 10552-2809 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Aug 25, 2006 · Amount on Record |
| Deed Sale | Aug 25, 2006 · Amount on Record |
| Deed Document Number | 2006462260084 |
| Prior Transfer Date | Dec 1, 2005 |
| Prior Transfer Doc | 0460690254 |
| Record Updated | Oct 29, 2026 |
Source: Westchester County and Mount Vernon City assessment roll, as of May 14, 2026
| Type | Name |
|---|---|
| State | New York |
| County | Westchester County |
| Municipality | Mount Vernon City |
| Unified School District | Mount Vernon School District (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $13,234.00 (-26.55%) | ||
| 2025 | $18,017.00 | $7,700 (-) Land $2,000 Building $5,700 | $427,778 (+6.67%) Land $111,111 Building $316,667 |
| 2024 | $7,700 (-) Land $2,000 Building $5,700 | $401,042 (-10.94%) Land $104,167 Building $296,875 | |
| 2023 | $7,700 Land $2,000 Building $5,700 | $450,292 Land $116,959 Building $333,333 |
Assessed value and assessed market value are set for property tax purposes, not market price estimates; both are a fraction of this property's market value.
Source: FEMA National Flood Hazard Layer, effective September 18, 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
Values are read at the parcel center point; lenders make the official flood determination.
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 | MOUNT VERNON WATER DEPARTMENT serves 73,893 people · EPA ID NY5903441 |
|---|---|
| Water Source | Purchased surface water from several systems |
| Last State Inspection | Jul 2025 |
| Lead | 7 ppb (2025–2027) action level 15 ppb |
| Water Quality | None last 10 years |
|---|---|
| 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 367 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Verizon Fiber · Fixed Wireless in parts of the area | 2,300 / 2,300 |
| Spectrum Cable · Fiber in parts of the area | 1,000 / 1,000 |
May also be available: Optimum, T-Mobile.
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