| Primary address | 521 Jefferson Avenue, Mamaroneck |
| Zip code | 10543 |
| County | Westchester |
| Municipality | Rye |
| Parcel ID | 154.34-2-8 |
View detailed information on past sales, title documents and property taxes, including the assessed market value, in their dedicated tabs.
| Sale date | 08/27/2025 |
| Sale price | $950,000 |
| Arm's length | Register |
| Current property tax | $21,840 |
| Building sqft | 2,045 |
| Building class | Two Family Year-Round Residence (220) |
| Acreage | 0.33 |
| Lot dimensions | 100 ft X 138 ft |
| Frontage | 100 |
| Depth | 138 |
| Year built | 1900 |
| Year last altered | 2011 |
| Stories | 2 |
| Units | 2 |
| Rooms | 11 |
| Bedrooms | 5 |
| Bathrooms | 3 |
| Half bathrooms | 1 |
| Kitchen | 2 |
| Water supply | Comm/public |
| Sewer | Comm/public |
| Zoning district | Register |
| School district | Rye Neck |
View more neighborhood information such as transportation, nearby schools and risk designations in the dedicated tab.
Property reports include comprehensive occupancy, improvement and development information (where available).
Create a free account to access valuable data points such as:
521 Jefferson Avenue, Mamaroneck, NY 10543 was built in 1900 and has a total of 2,045 square feet.
What is the assessed value of 521 Jefferson Avenue, Mamaroneck, NY 10543 and the property tax paid?Assessed at $970,100, the tax amount paid for 521 Jefferson Avenue, Mamaroneck, NY 10543 is $20,961.
When was 521 Jefferson Avenue, Mamaroneck, NY 10543 last sold and what was the last sale price?521 Jefferson Avenue, Mamaroneck, NY 10543 was last sold in 08/27/2025 for $950,000.
How many residential units does this building have?This building has 2 residential unit(s).
View detailed property contacts like owners, building management, representatives from permits and tenants with a free account.
Create a free account to view the complete sales history for 521 Jefferson Avenue, Mamaroneck, including title documents, transfer conditions, mortgages and liens.
*Here are the three most recent sales for this property.
To view the complete history of deeds, mortgages, assignments of leases and rents, and more, sign up for free. Available data goes back to 1966.
R: Recorded date
D: Document date
Access detailed property tax data for 521 Jefferson Avenue, Mamaroneck, NY 10543. Tax information included: property tax, market value and assessed value, exemptions, abatements, and assessment history.
| Tax year | 2025 |
| Base tax | $20,962 |
| Current property tax | $21,840 |
| Market value | $970,100 |
| Assessed value | $970,100 |
Here's the assessment & property tax history for 521 Jefferson Avenue, Mamaroneck, including the evolution of the total tax rate and corresponding property tax.
| Year | Market value | Assessment value | Total tax rate | Property tax | Year over year change |
|---|---|---|---|---|---|
| 2025 | $970,100 | $970,100 | 21.6079 | $20,962 | +6.92% |
| 2024 | $915,100 | $915,100 | 21.4249 | $19,606 | -1.03% |
| 2023 | $877,500 | $877,500 | 22.5745 | $19,809 | +11.02% |
| 2022 | $766,100 | $766,100 | 23.2904 | $17,843 | +1.44% |
| 2021 | $702,800 | $702,800 | 25.0283 | $17,590 | -5.48% |
Access a detailed real estate market overview of Mamaroneck so you can assess current trends, home values, types of properties sold and transaction volume. View the median home sale price in Mamaroneck and compare it to other neighborhoods in Westchester County.
Create a free account to unlock extended information for 521 Jefferson Avenue, Mamaroneck, including whether it's located in FEMA flood zones, floodways or special flood hazard areas, as well as the Coastal barriers resources system area (COBRA).
| FEMA flood zone(s) | X (See more on map) |
Access the detailed traffic volume map for 521 Jefferson Avenue, Mamaroneck to see estimated average daily traffic on streets surrounding the property as well as the types of properties in its vicinity.
| View daily traffic map |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| Mamaroneck Avenue School | 6 | Public | K-5 | 684 | 0.31 |
| F E Bellows Elementary School | 8 | Public | 3-5 | 347 | 0.44 |
| French-American School of New York | NR | Private | PK-12 | 765 | 0.51 |
| French-American School of New York | NR | Private | PK-12 | 765 | 0.51 |
| Daniel Warren Elementary School | NR | Public | K-2 | 320 | 0.62 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| French-American School of New York | NR | Private | PK-12 | 765 | 0.51 |
| Rye Neck Middle School | 7 | Public | 6-8 | 351 | 0.90 |
| Westchester Day School | NR | Private | PK, K-8 | 379 | 1.58 |
| Louis M Klein Middle School | 7 | Public | 6-8 | 824 | 1.64 |
| Ss John & Paul School | NR | Private | PK-8 | 349 | 1.68 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| French-American School of New York | NR | Private | PK-12 | 765 | 0.51 |
| Rye Neck Senior High School | 9 | Public | 9-12 | 515 | 0.90 |
| Mamaroneck High School | 8 | Public | 9-12 | 1,660 | 1.27 |
| Westchester Hebrew High School | NR | Private | 9-12 | 87 | 1.58 |
| Harrison High School | 9 | Public | 9-12 | 1,064 | 1.67 |
Data provided by GreatSchools.org © 2025. All rights reserved.
Here are the neighbors for 521 Jefferson Avenue, Mamaroneck.
| Address | Square feet | Purchase date | Purchase price |
|---|---|---|---|
| 531 Hillside Ave, Mamaroneck | 2,498 | 01/23/2020 | |
| 614 Hillside Ave, Mamaroneck | 3,094 | 04/26/2022 | |
| 458 Halstead Ave, Mamaroneck | 3,500 | 07/25/2016 | |
| 466 Halstead Ave, Mamaroneck | 1,319 | 08/08/2011 | |
| 527 Jefferson Ave, Mamaroneck | 1,864 | 02/06/2015 | $400,000 |
| 600 Hillside Ave, Mamaroneck | 2,120 | 04/03/2025 | $1 |
| 430 Jefferson Ave, Mamaroneck | 1,272 | 12/18/2003 | $465,012 |
| 515 Jefferson Ave, Mamaroneck | 1,786 | 07/01/2024 | $10 |
| 500 Halstead Ave, Mamaroneck | 6,345 | 09/07/2023 | |
| 609 Hillside Ave, Mamaroneck | 2,504 | ||
| 434 Jefferson Ave, Mamaroneck | 1,684 | ||
| 512 Jefferson Ave, Mamaroneck | 1,410 | ||
| 620 Hillside Ave, Mamaroneck | 3,182 | 12/21/2009 | |
| 426 Jefferson Ave, Mamaroneck | 1,103 | 04/26/2022 | |
| 511 Jefferson Ave, Mamaroneck | 1,782 | 07/01/2024 | $10 |
| 531 Jefferson Ave, Mamaroneck | 2,432 | 08/02/2018 | |
| 635 Hillside Ave, Mamaroneck | 2,125 | 05/01/2026 | $675,000 |
| 504 Jefferson Ave, Mamaroneck | 3,024 | ||
| 535 Jefferson Ave, Mamaroneck | 2,051 | 08/17/2018 | |
| 422 Jefferson Ave, Mamaroneck | 2,212 | 07/01/2024 |