403 Union Ave
Mamaroneck, NY 10543
6 bd 4 ba 2,299 sqft Built 1880 Lot 5,596 sqft multi_family
No recorded sales
Location
Timeline: Sale, Listing & Tax History
Recorded events
| Date | Event | Price | Source |
|---|---|---|---|
| Dec 23, 2021 | Sold | $799,000 | Public Record |
| Oct 7, 2021 | Listing removed | $799,900 | OneKeyMLS |
| Sep 8, 2021 | Price changed | $799,900 | OneKeyMLS |
| Jul 27, 2021 | Listed | $829,900 | OneKeyMLS |
Tax assessment history
| Year | Building | Land | Total assessed | Tax paid |
|---|---|---|---|---|
| 2025 | $578,900 | $357,000 | $935,900 | $21,714 |
| 2024 | $534,300 | $357,000 | $891,300 | $20,809 |
| 2023 | $476,200 | $340,000 | $816,200 | $15,474 |
| 2022 | $377,000 | $340,000 | $717,000 | $14,599 |
| 2021 | $377,000 | $340,000 | $717,000 | $16,124 |
| 2020 | $277,500 | $268,800 | $546,300 | $14,311 |
| 2018 | $246,500 | $264,400 | $510,900 | $9,926 |
| 2017 | $270,400 | $262,300 | $532,700 | $8,712 |
| 2016 | $307,200 | $245,100 | $552,300 | $12,054 |
| 2015 | $222,400 | $212,400 | $434,800 | $9,398 |
| 2014 | $222,400 | $205,300 | $427,700 | $19,145 |
| 2013 | $225,300 | $205,300 | $430,600 | $147,349 |
| 2012 | $295,200 | $205,300 | $500,500 | $16,738 |
| 2011 | $450,000 | $176,600 | $626,600 | $2,727 |
| 2008 | $521,200 | $207,400 | $728,600 | $11,251 |
| 2007 | $516,100 | $207,400 | $723,500 | $10,610 |
Property facts
Year built
1880
Property type
multi_family
Stories
—
Beds
6
Baths
4
Living area
2,299 sqft
Lot size
5,596 sqft
ZIP code
10543
City
Mamaroneck
Street
Union Ave
Coordinates
40.95427, -73.73304
Comparable properties nearby
Block-level micro-comps
Same street, ±3 house numbers, sold in the last 24 monthsFrequently asked questions
When did 403 Union Ave last sell?
No public-record sale is on file for 403 Union Ave.
What is the current tax assessment for 403 Union Ave?
The most recent total assessment for 403 Union Ave (year 2025) is $935,900 with $21,714 in property tax.
When was 403 Union Ave built?
403 Union Ave was built in 1880.
How does 403 Union Ave compare to others on Union Ave?
We track 5 other properties on Union Ave. Browse the list under "Other properties on Union Ave" to compare beds, baths, and sale history.
What are the property facts for 403 Union Ave?
403 Union Ave is a 6 bed, 4 bath, 2,299 sqft, 5,596 sqft lot multi_family.
Is 403 Union Ave a flip candidate?
No — 403 Union Ave does not appear in our flips dataset.
Is 403 Union Ave a tax-appeal candidate?
Yes — 403 Union Ave appears in our tax-appeal candidates list, meaning its current assessment exceeds its recent sale price by 15% or more.
Forecast for this area
ZIP-area linear projection — not a per-property automated valuationQuarterly trend
-6.8%
Implied 1-yr
-27.2%
2026 Q3
$693.8K
2026 Q4
$693.8K
ZIP 10543 — Median Price History + Forecast
Explore nearby
Geography
Other properties on Union Ave