21 Williams Ave
Syosset, NY 11791
5 bd 3 ba 2,422 sqft Built 1955 Lot 7,360 sqft single_family
No recorded sales
Location
Timeline: Sale, Listing & Tax History
Recorded events
No recorded events
No sale or listing events are on file for this property.
Tax assessment history
| Year | Building | Land | Total assessed | Tax paid |
|---|---|---|---|---|
| 2024 | $452 | $362 | $814 | $22,414 |
| 2023 | $452 | $362 | $814 | $24,607 |
| 2022 | $452 | $362 | $814 | $20,738 |
| 2021 | $452 | $362 | $814 | $19,955 |
| 2020 | $440 | $352 | $792 | $18,416 |
| 2019 | $313 | $708 | $1,021 | $16,517 |
| 2018 | $381 | $708 | $1,089 | $16,588 |
| 2016 | $449 | $708 | $1,157 | $16,893 |
| 2015 | $701 | $708 | $1,409 | $16,929 |
| 2014 | $644 | $708 | $1,352 | $14,924 |
| 2013 | $689 | $708 | $1,397 | $15,332 |
| 2011 | $667 | $685 | $1,352 | $11,705 |
| 2010 | $568 | $708 | $1,276 | $11,498 |
| 2009 | $963 | $708 | $1,671 | $12,712 |
| 2007 | $872 | $708 | $1,580 | $11,571 |
Property facts
Year built
1955
Property type
single_family
Stories
—
Beds
5
Baths
3
Living area
2,422 sqft
Lot size
7,360 sqft
ZIP code
11791
City
Syosset
Street
Williams Ave
Coordinates
40.80360, -73.50111
Comparable properties nearby
Block-level micro-comps
Same street, ±3 house numbers, sold in the last 24 monthsFrequently asked questions
When did 21 Williams Ave last sell?
No public-record sale is on file for 21 Williams Ave.
What is the current tax assessment for 21 Williams Ave?
The most recent total assessment for 21 Williams Ave (year 2024) is $814 with $22,414 in property tax.
When was 21 Williams Ave built?
21 Williams Ave was built in 1955.
How does 21 Williams Ave compare to others on Williams Ave?
We track 6 other properties on Williams Ave. Browse the list under "Other properties on Williams Ave" to compare beds, baths, and sale history.
What are the property facts for 21 Williams Ave?
21 Williams Ave is a 5 bed, 3 bath, 2,422 sqft, 7,360 sqft lot single_family.
Is 21 Williams Ave a flip candidate?
No — 21 Williams Ave does not appear in our flips dataset.
Is 21 Williams Ave a tax-appeal candidate?
No — 21 Williams Ave is not currently flagged as a tax-appeal candidate.
Forecast for this area
ZIP-area linear projection — not a per-property automated valuationQuarterly trend
+2.9%
Implied 1-yr
+11.6%
2026 Q3
$1.84M
2026 Q4
$1.88M
ZIP 11791 — Median Price History + Forecast
Explore nearby
Geography
Other properties on Williams Ave