18 William Ave
Central Islip, NY 11722
— ba 1,270 sqft Built 1940 Lot 7,405 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 |
|---|---|---|---|---|
| 2025 | $22,300 | $6,100 | $28,400 | $9,499 |
| 2024 | $22,300 | $6,100 | $28,400 | $9,104 |
| 2023 | $22,300 | $6,100 | $28,400 | $9,104 |
| 2022 | $19,450 | $6,100 | $25,550 | $8,153 |
| 2021 | $19,450 | $6,100 | $25,550 | $8,047 |
| 2020 | $19,450 | $6,100 | $25,550 | $8,025 |
| 2018 | $19,450 | $6,100 | $25,550 | $7,910 |
| 2017 | $19,450 | $6,100 | $25,550 | $7,848 |
| 2016 | $19,450 | $6,100 | $25,550 | $7,785 |
| 2015 | $19,450 | $6,100 | $25,550 | $7,737 |
| 2014 | $19,450 | $6,100 | $25,550 | $7,690 |
| 2013 | $19,450 | $6,100 | $25,550 | $7,608 |
| 2012 | $19,450 | $6,100 | $25,550 | $7,504 |
| 2011 | $19,450 | $6,100 | $25,550 | $7,259 |
| 2010 | $19,450 | $6,100 | $25,550 | $7,014 |
| 2008 | $19,450 | $6,100 | $25,550 | $6,445 |
Property facts
Year built
1940
Property type
single_family
Stories
—
Beds
—
Baths
—
Living area
1,270 sqft
Lot size
7,405 sqft
ZIP code
11722
City
Central Islip
Street
William Ave
Coordinates
40.79434, -73.20156
Comparable properties nearby
Block-level micro-comps
Same street, ±3 house numbers, sold in the last 24 monthsFrequently asked questions
When did 18 William Ave last sell?
No public-record sale is on file for 18 William Ave.
What is the current tax assessment for 18 William Ave?
The most recent total assessment for 18 William Ave (year 2025) is $28,400 with $9,499 in property tax.
When was 18 William Ave built?
18 William Ave was built in 1940.
How does 18 William Ave compare to others on William Ave?
We track 4 other properties on William Ave. Browse the list under "Other properties on William Ave" to compare beds, baths, and sale history.
What are the property facts for 18 William Ave?
18 William Ave is a — bath, 1,270 sqft, 7,405 sqft lot single_family.
Is 18 William Ave a flip candidate?
No — 18 William Ave does not appear in our flips dataset.
Is 18 William Ave a tax-appeal candidate?
No — 18 William 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
-11.7%
2026 Q1
$467.5K
2026 Q2
$450.6K
ZIP 11722 — Median Price History + Forecast
Explore nearby
Geography
Other properties on William Ave