Westchester County and Mamaroneck Town property record for 133 E Prospect Ave, Mamaroneck, NY 10543
| Property Type | Mixed Use Commercial Office / Residential |
|---|---|
| Details | 1,940 sqft · built 1920 |
| Lot Size | 0.05 acres (2,178 sqft) |
| Owner | 2 Company Names on Record |
| Last Sale | $400,000 (Dec 2014) |
| Tax Bill | $8,348 (2025) |
| Deeds & Mortgages | Apr 2021 Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 553203 9-12-168 |
| Primary APN | 553203 9-12-168 |
|---|---|
| Alternative APNs |
|
| Stories | 2 Stories |
|---|---|
| Building Area | 1,940 sqft Gross Area |
| Basement Area | 1,400 sqft |
| Unfinished Basement | 1,400 sqft |
| Year Built | Built 1920 |
|---|---|
| Effective Year Built | Effective 1980 |
| Lot Area | 2,178 sqft (0.05 acres) |
| Lot Dimensions | 40 ft deep x 61 ft wide |
| Heating Fuel | Oil |
|---|---|
| Sewer | Municipal |
| Water Source | Commercial |
| Account Number | 651900 |
|---|---|
| Street Address | 133 E PROSPECT AVE |
| City | MAMARONECK |
| State | NY |
| Zip | 10543-3710 |
| Property Category | Commercial |
| Property Type | Commercial > Office > Mixed Use Commercial Office / Residential |
| Local Zoning Code | C2 |
| Legal Block | 168 |
| Jurisdiction | WESTCHESTER NY |
| Township / Civil Division | MAMARONECK |
| Census Block Group | 1 |
| Census Block | 1007 |
| Census Tract | 7200 |
Source: Westchester County and Mamaroneck Town records, as of May 14, 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | 2 Company Names on Record |
|---|---|
| Mailing Address | 62 W 45TH ST, 8, NEW YORK, NY 10036-4208 |
| Owner Type | Company |
| Vesting | Company |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Dec 17, 2014 · Amount on Record |
| Deed Sale | Dec 17, 2014 · Amount on Record |
| Deed Document Number | 2014543423139 |
| Record Updated | Jun 8, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | WESTCHESTER NY |
| Property Address | 133 E PROSPECT AVE, MAMARONECK, NY 10543-3710 |
| Transaction Type | Mortgage |
| Record Updated | Dec 6, 2022 |
| Name | Verified Name |
|---|
| Document Number | 0611173487 |
|---|---|
| Date | Apr 27, 2021 |
| Instrument | 611173487 |
| Name | 151 MAMARONECK AVEUUC LLC |
|---|---|
| Type | Non-Lending Institution |
| Type | Commercial Mortgage |
|---|---|
| Amount | Amount Recorded |
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 |
|---|---|---|---|
| 2025 | $8,348.00 | $512,000 (-) Land $225,000 Building $287,000 | $512,000 (-) Land $225,000 Building $287,000 |
| 2024 | $512,000 (+28%) Land $225,000 Building $287,000 | $512,000 (+28%) Land $225,000 Building $287,000 | |
| 2023 | $400,000 Land $225,000 Building $175,000 | $400,000 Land $225,000 Building $175,000 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
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 |
|---|---|
| Nearest Special Flood Hazard Area | Zone AE, within 100 ft |
| Flood Insurance Requirement | Not required lenders may require it |
| Community Rating System | Class 8 (10% premium discount) |
| Nearby Flood Policies | 123 units insured incl. 114 condo units |
| Nearby Flood Claims | 16 (1979–2023) |
| Claims Outside the SFHA | 2 of 16 |
| 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.
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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