21 Elm St
Central Islip, NY 11722
— ba 1,196 sqft Built 1991 Lot 5,663 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 | $19,800 | $4,000 | $23,800 | $4,531 |
| 2017 | $19,800 | $4,000 | $23,800 | $5,912 |
| 2016 | $19,800 | $4,000 | $23,800 | $5,863 |
| 2015 | $19,800 | $4,000 | $23,800 | $5,846 |
| 2014 | $22,800 | $4,000 | $26,800 | $6,671 |
| 2013 | $22,800 | $4,000 | $26,800 | $6,610 |
| 2012 | $22,800 | $4,000 | $26,800 | $6,528 |
| 2011 | $22,800 | $4,000 | $26,800 | $6,297 |
| 2010 | $22,800 | $4,000 | $26,800 | $6,067 |
| 2008 | $22,800 | $4,000 | $26,800 | $5,607 |
| 2007 | $22,800 | $4,000 | $26,800 | $5,284 |
Property facts
Year built
1991
Property type
single_family
Stories
—
Beds
—
Baths
—
Living area
1,196 sqft
Lot size
5,663 sqft
ZIP code
11722
City
Central Islip
Street
Elm St
Coordinates
40.77645, -73.20301
Comparable properties nearby
Block-level micro-comps
Same street, ±3 house numbers, sold in the last 24 monthsFrequently asked questions
When did 21 Elm St last sell?
No public-record sale is on file for 21 Elm St.
What is the current tax assessment for 21 Elm St?
The most recent total assessment for 21 Elm St (year 2025) is $23,800 with $4,531 in property tax.
When was 21 Elm St built?
21 Elm St was built in 1991.
How does 21 Elm St compare to others on Elm St?
We track 8 other properties on Elm St. Browse the list under "Other properties on Elm St" to compare beds, baths, and sale history.
What are the property facts for 21 Elm St?
21 Elm St is a — bath, 1,196 sqft, 5,663 sqft lot single_family.
Is 21 Elm St a flip candidate?
No — 21 Elm St does not appear in our flips dataset.
Is 21 Elm St a tax-appeal candidate?
No — 21 Elm St 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