21 Green Knoll Ct
Northport, NY 11768
5 bd 3 ba 2,500 sqft Built 1975 Lot 43,560 sqft single_family
Most recent sale
$550,000
Aug 9, 2017
Location
Timeline: Sale, Listing & Tax History
Recorded events
| Date | Event | Price | Source |
|---|---|---|---|
| Dec 29, 2022 | Sold | $835,000 | Public Record |
| Nov 4, 2022 | Sold | $815,000 | OneKeyMLS |
| Sep 5, 2022 | Listing removed | $1,198,000 | OneKeyMLS |
| Jul 27, 2022 | Price changed | $799,000 | MLS #3402322 |
| Jul 12, 2022 | Price changed | $839,000 | MLS #3402322 |
| Jun 6, 2022 | Price changed | $874,000 | MLS #3402322 |
| May 24, 2022 | Listed | $925,000 | MLS #3402322 |
| May 21, 2022 | Price changed | $925,000 | MLS #3388165 |
| Apr 27, 2022 | Price changed | $974,000 | MLS #3388165 |
| Apr 1, 2022 | Listed | $998,000 | MLS #3388165 |
| Mar 4, 2022 | Listed | $1,198,000 | MLS #H6169887 |
| May 21, 2020 | Listing removed | $598,875 | OneKeyMLS |
| Aug 9, 2017 | Sold | $550,000 | Public Record |
| Jun 15, 2017 | Sold | $550,000 | MLS #2909104 |
| Jan 25, 2017 | Listed | $565,000 | MLS #2909104 |
| Jan 12, 2017 | Listing removed | $598,875 | OneKeyMLS |
| Oct 21, 2016 | Price changed | $598,875 | MLS #2871892 |
| Jul 26, 2016 | Listed | $619,875 | MLS #2871892 |
| Jun 26, 2016 | Listing removed | $589,000 | OneKeyMLS |
| May 26, 2016 | Price changed | $589,000 | MLS #2819662 |
| Jan 8, 2016 | Listing removed | $595,000 | OneKeyMLS |
| Sep 28, 2015 | Price changed | $595,000 | MLS #2778879 |
| Jul 8, 2015 | Listed | $595,000 | MLS #2819662 |
| Jun 23, 2015 | Listing removed | $625,000 | OneKeyMLS |
| May 11, 2015 | Listed | $625,000 | MLS #2762253 |
| Nov 11, 2014 | Listing removed | $599,000 | OneKeyMLS |
| Oct 1, 2014 | Price changed | $599,000 | MLS #2691499 |
| Jul 18, 2014 | Listed | $649,000 | MLS #2691499 |
| Jul 7, 2014 | Listing removed | $649,000 | OneKeyMLS |
| May 29, 2014 | Price changed | $649,000 | MLS #2654393 |
| Mar 14, 2014 | Listed | $659,000 | MLS #2654393 |
| Jan 1, 2014 | Listing removed | $659,000 | OneKeyMLS |
| Sep 3, 2013 | Price changed | $659,000 | MLS #2561084 |
| Feb 27, 2013 | Listed | $699,000 | MLS #2561084 |
| Sep 26, 2007 | Sold | $780,000 | Public Record |
| Jul 31, 1992 | Sold | $245,000 | Public Record |
| Oct 28, 1986 | Sold | $350,000 | Public Record |
Tax assessment history
| Year | Building | Land | Total assessed | Tax paid |
|---|---|---|---|---|
| 2025 | $2,700 | $1,000 | $3,700 | $13,278 |
| 2024 | $2,700 | $1,000 | $3,700 | $12,180 |
| 2023 | $2,700 | $1,000 | $3,700 | $11,728 |
| 2022 | $2,700 | $1,000 | $3,700 | $11,518 |
| 2021 | $3,050 | $1,000 | $4,050 | $11,171 |
| 2020 | $3,050 | $1,000 | $4,050 | $11,998 |
| 2019 | $3,050 | $1,000 | $4,050 | $11,998 |
| 2018 | $3,050 | $1,000 | $4,050 | $11,695 |
| 2017 | $4,400 | $1,000 | $5,400 | $15,129 |
| 2016 | $4,400 | $1,000 | $5,400 | $13,156 |
| 2015 | $4,400 | $1,000 | $5,400 | $12,840 |
| 2014 | $4,400 | $1,000 | $5,400 | $12,623 |
| 2013 | $4,400 | $1,000 | $5,400 | $12,873 |
| 2012 | $4,400 | $1,000 | $5,400 | $12,637 |
| 2011 | $4,400 | $1,000 | $5,400 | $12,230 |
| 2010 | $4,400 | $1,000 | $5,400 | $12,076 |
| 2009 | $4,400 | $1,000 | $5,400 | $13,623 |
| 2008 | $5,075 | $1,000 | $6,075 | $12,508 |
| 2007 | $5,075 | $1,000 | $6,075 | $12,103 |
| 2006 | $5,075 | $1,000 | $6,075 | $12,103 |
Property facts
Year built
1975
Property type
single_family
Stories
2
Beds
5
Baths
3
Living area
2,500 sqft
Lot size
43,560 sqft
ZIP code
11768
City
Northport
Street
Green Knoll Ct
Coordinates
40.91492, -73.30639
Comparable properties nearby
Block-level micro-comps
Same street, ±3 house numbers, sold in the last 24 monthsFrequently asked questions
When did 21 Green Knoll Ct last sell?
21 Green Knoll Ct most recently sold on Aug 9, 2017 for $550,000.
What is the current tax assessment for 21 Green Knoll Ct?
The most recent total assessment for 21 Green Knoll Ct (year 2025) is $3,700 with $13,278 in property tax.
How does 21 Green Knoll Ct's assessment compare to its last sale price?
The current assessment is 99.3% below the last sale price of $550,000.
When was 21 Green Knoll Ct built?
21 Green Knoll Ct was built in 1975.
How does 21 Green Knoll Ct compare to others on Green Knoll Ct?
We track 7 other properties on Green Knoll Ct. Browse the list under "Other properties on Green Knoll Ct" to compare beds, baths, and sale history.
What are the property facts for 21 Green Knoll Ct?
21 Green Knoll Ct is a 5 bed, 3 bath, 2,500 sqft, 43,560 sqft lot single_family.
Is 21 Green Knoll Ct a flip candidate?
No — 21 Green Knoll Ct does not appear in our flips dataset.
Is 21 Green Knoll Ct a tax-appeal candidate?
No — 21 Green Knoll Ct is not currently flagged as a tax-appeal candidate.
Forecast for this area
ZIP-area linear projection — not a per-property automated valuationQuarterly trend
-1.2%
Implied 1-yr
-5.0%
2026 Q3
$1.02M
2026 Q4
$1.01M
ZIP 11768 — Median Price History + Forecast
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Geography
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