Westchester County  »  10543  »  Jefferson Ave  »  521 Jefferson Ave

521 Jefferson Avenue, Mamaroneck, NY 10543 - Property report

Also known as: 521 Jefferson Ave

Property image for 521 Jefferson Avenue, Mamaroneck, NY 10543
static Mapbox map

Property type

Two Family Year-Round Residence (220)

Year built

1900

Acreage

0.33

Sale price

$950,000

General information

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Address
Primary address
521 Jefferson Avenue
ZIP code
10543
County
Westchester
SWIS code
Village of Mamaroneck
Parcel ID
154.34-2-8

Owner

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Sales
Sale date
08/27/2025
Sale price
$950,000
Arm's length
Tax
Tax year
2025
Current property tax
$21,840
Zoning & Use
Zoning
R-2F
Units
2
Building
Property type
Two Family Year-Round Residence (220)
Building sq. ft.
2,045
Buildings on lot
1
Stories
2
Year built
1900
AC
Yes
Rooms
11
Bedrooms
5
Bathrooms
3
Half bathrooms
1
Condition
Good
Exterior wall
Alum/vinyl
Building style
Old style
Kitchen
2
Basement
3
Heating
Hot air
Fuel
Gas
First story sq. ft.
Second story sq. ft.
Lot
Lot dimensions
100 ft X 138 ft
Acreage
0.33
Frontage
100 ft
Depth
138
Water
Comm/public
Sewer
Comm/public

Area overview

Walk score
85 /100.  Very Walkable
Transit score
50 /100.  Good Transit
Bike score
67 /100.  Bikeable
School district
554801

View more such as transportation, nearby schools and risk designations.

Ownership

Ownership information for 521 Jefferson Avenue, Mamaroneck, NY

Property owner name
Registered owner
Source
Deed
Owner contact information
Phone number
Owner address
Documents

Sales history for 521 Jefferson Avenue, Mamaroneck, NY 10543

Sale date Sale price Buyer name Seller name
08/27/2025 $950,000 XXXXXXXX XXXXXXX; XXXXXXX XXXXXXXXX XX XXX XXXXXXXXXX XX XXX
05/03/2022 $924,000 XX XXX XXXXXXXXXX XX XXX XXX XXXXXXXX XXX XXX
06/30/2011 $375,000 XXXXXXXXX-XXXXXXX XXXXXXX; XXXX-XXXXXXX XXXXXXX XXXX X XXXXXXXXXX XXXXXXXXX XXXXXX XXXXX; XXXX X-XXXXXXX XXXXXXXXXX

*Most recent sales on record for this property.

More about Westchester County property records.

Title documents

Date Type Amount Party 1 Party 2
09/04/2025 - R
08/27/2025 - D		 Mortgage XXXXXXXXX XXXXXXX XXXXXXXX XXXXX XXXX XX
09/04/2025 - R
08/27/2025 - D		 Deed XX XXX XXXXXXXXXX XX XXX XXXXXXXX XXXXXXX
09/27/2023 - R
09/15/2023 - D		 Assignment XXXXXXXXX XXXXXXXXX XXXX XXXXXXXXXX XXXXXXX XXXX XXXXXXX XXX
05/12/2022 - R
05/03/2022 - D		 Mortgage XX XXX XXXXXXXXXX XX XXX XXXX
05/12/2022 - R
05/03/2022 - D		 Deed XXX XXXXXXXX XXX XXX XX XXX XXXXXXXXXX XX XXX
03/08/2016 - R
02/11/2015 - D		 Deed XXXXXXXXX XXXXXXX XXX XXXXXXXXX XXX XXX
07/08/2011 - R
06/30/2011 - D		 Deed XXXX X XXXXXXXXXX XXXXXXXXX XXXXXX XXXXX XXXXXXXXX-XXXXXXX XXXXXXX
04/18/2005 - R
03/21/2005 - D		 Deed XXXXXXXXXX XXXXX XXXXXXXXXX XXXXXXXXX XXXXXX
11/10/2004 - R
04/09/2004 - D		 Deed
(Life estate deed)		 XXXXXXXXXX XXXXX XXXXXXXXXX XXXXX

*Most recent recorded documents on file for this property.

R: Recorded date
D: Document date

Tax

Property taxes for 521 Jefferson Avenue, Mamaroneck, NY

Property tax data includes tax amount, market value and assessed value, exemptions, abatements and assessment history.

Current property tax
Tax year
2025
Current property tax
$21,840
Base tax
$20,962
Recent tax assessments
Market value
$970,100
Land value
$382,400
Building value
$587,700
Assessed value
$970,100

More about Westchester County property taxes

Assessment history

See the assessment and property tax history, including the evolution of the total tax rate and corresponding property tax amount.

Tax year Market value Assessed value Tax rate Property tax Y-o-Y 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%
2020 $702,800 $702,800 26.47812 $18,609 +11.89%
2019 $588,000 $588,000 28.285446 $16,632 +16.62%
2018 $550,100 $550,100 25.9262 $14,262 -4.21%
2017 $572,900 $572,900 25.989782 $14,890 +5.63%
2016 $524,800 $524,800 26.86073 $14,097 -13.30%
Permits

Permit information for 521 Jefferson Avenue, Mamaroneck, NY

No recently recorded permits for this property.

Neighborhood

Mamaroneck residential market stats

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.

Median sale price

$1,060,000

-35.1% Y-o-Y

Median price/sq. ft.

$534

-14.4% Y-o-Y

Westchester county median sale price

$850,000

4.9% Y-o-Y

Risk

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FEMA flood zones

FEMA flood zones
X

Transportation

Daily traffic map
View daily traffic map

Access the detailed traffic volume map for 521 Jefferson Avenue, Mamaroneck, NY 10543 to see estimated average daily traffic on streets surrounding the property as well as the types of properties in its vicinity.

Schools

Nearest elementary schools

Name Rating Type Grade range No of students Distance (miles)
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
Parsons Memorial School 5 Public K-5 488 1.06
Central School 8 Public PK, K-5 513 1.56
Central School 8 Public PK, K-5 513 1.56
Westchester Day School NR Private PK, K-8 379 1.58
Westchester Day School NR Private PK, K-8 379 1.58
Nearest middle schools

Name Rating Type Grade range No of students Distance (miles)
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
Hommocks School 7 Public 6-8 1,258 1.76
Windward School NR Private 1-9 0 2.27
Albert Leonard Middle School 7 Public 6-8 1,086 2.61
Hudson Country Montessori School NR Private PK-8 201 2.66
Rye Middle School 10 Public 6-8 685 2.67
Nearest high schools

Name Rating Type Grade range No of students Distance (miles)
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
Rye High School 10 Public 9-12 903 2.67
Solomon Schechter School of Westchester NR Private K-12 741 2.80
Thornton-Donovan School NR Private K-12 170 3.10
Iona Preparatory School NR Private PK-12 1,008 3.22
Scarsdale Middle School 10 Public 6-8, 10 1,131 3.37

Data provided by GreatSchools.org © 2026. All rights reserved.

Neighbors for 521 Jefferson Avenue, Mamaroneck, NY

531 Hillside Ave, Mamaroneck 614 Hillside Ave, Mamaroneck 458 Halstead Ave, Mamaroneck 466 Halstead Ave, Mamaroneck 527 Jefferson Ave, Mamaroneck 600 Hillside Ave, Mamaroneck 430 Jefferson Ave, Mamaroneck 515 Jefferson Ave, Mamaroneck 500 Halstead Ave, Mamaroneck 609 Hillside Ave, Mamaroneck 434 Jefferson Ave, Mamaroneck 512 Jefferson Ave, Mamaroneck 620 Hillside Ave, Mamaroneck 426 Jefferson Ave, Mamaroneck 511 Jefferson Ave, Mamaroneck 531 Jefferson Ave, Mamaroneck 635 Hillside Ave, Mamaroneck 504 Jefferson Ave, Mamaroneck 535 Jefferson Ave, Mamaroneck 422 Jefferson Ave, Mamaroneck

Nearby ZIP codes for 521 Jefferson Avenue, Mamaroneck, NY

10528, Westchester County, NY 10530, Westchester County, NY 10538, Westchester County, NY 10552, Westchester County, NY 10553, Westchester County, NY 10573, Westchester County, NY 10577, Westchester County, NY 10580, Westchester County, NY 10583, Westchester County, NY 10601, Westchester County, NY 10604, Westchester County, NY 10605, Westchester County, NY 10606, Westchester County, NY 10707, Westchester County, NY 10708, Westchester County, NY 10709, Westchester County, NY 10801, Westchester County, NY 10803, Westchester County, NY 10804, Westchester County, NY 10805, Westchester County, NY

Frequently asked questions

What is the year built for 521 Jefferson Avenue, Mamaroneck, NY 10543?

The development at 521 Jefferson Avenue, Mamaroneck, NY 10543 was built in 1900.

What is the total square footage of 521 Jefferson Avenue, Mamaroneck, NY 10543?

521 Jefferson Avenue, Mamaroneck, NY 10543 has a total of 2,045 square feet.

When was 521 Jefferson Avenue, Mamaroneck, NY 10543 last sold and what was the sale price?

521 Jefferson Avenue, Mamaroneck, NY 10543 was last sold on 08/27/2025 for $950,000.

What is the assessed value of 521 Jefferson Avenue, Mamaroneck, NY 10543?

521 Jefferson Avenue, Mamaroneck, NY 10543 is currently assessed at $970,100.

What are the property taxes for 521 Jefferson Avenue, Mamaroneck, NY 10543?

The property taxes for 521 Jefferson Avenue, Mamaroneck, NY 10543 total $20,961.

How many residential units does this building have?

This building has 2 residential unit(s).

Disclaimer

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