Nassau County and Oyster Bay Town property records for 50 addresses on Underhill Ave, Syosset, NY · Last verified October 2026
| Properties | 50 |
|---|---|
| Median Sale Price | $950,000 |
| Deeds and Mortgages on File | 49 |
| Median Price per Sqft | $473 |
| Owner Occupied | 96% |
| Median Annual Tax Bill | $17,643 |
| Median Year Built | 1954 |
| Median Ownership Tenure | 15 years |
Owner names and prior sale amounts shown locked below are available instantly with a free trial.
2 ba · 1,582 sqft · built 1950 · 0.259 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $950,000Aug 2025 | $19,8132025 | Amount on Record Jul 2018 | 2 Owners on Record | Assessor + 2 DocumentsUpdated Oct 2026 |
3 ba · 2,284 sqft · built 2016 · 0.189 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $853,400Jul 2016 | $25,7792025 | Amount on Record May 2015 | 2 Owners on Record Owner Occupied | AssessorUpdated Oct 2026 |
2 ba · 1,664 sqft · built 1950 · 0.154 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $995,000Sep 2025 | $16,7012025 | Amount on Record May 1998 | 2 Owners on Record Owner Occupied | Assessor + 2 DocumentsUpdated Oct 2026 |
2 ba · 1,505 sqft · built 1950 · 0.154 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $212,000Jun 1999 | $18,4002025 | —Jun 1999 | Owner on Record Owner Occupied | AssessorUpdated Jun 2026 |
1 ba · 1,252 sqft · built 1950 · 0.194 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $16,6072025 | 2 Owners on Record Owner Occupied | AssessorUpdated Jun 2026 |
2 ba · 1,068 sqft · built 1950 · 0.154 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $405,000Jan 2004 | $15,7282025 | 2 Owners on Record Owner Occupied | Assessor + 2 DocumentsUpdated Jun 2026 |
1.5 ba · 1,460 sqft · built 1950 · 0.141 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $600,000Feb 2020 | $19,5622025 | Amount on Record Jan 2000 | 2 Owners on Record Owner Occupied | Assessor + 1 DocumentUpdated Oct 2026 |
1 ba · 1,270 sqft · built 1950 · 0.154 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $585,000Nov 2020 | $15,6682025 | 2 Owners on Record Owner Occupied | Assessor + 2 DocumentsUpdated Oct 2026 |
2 ba · 1,334 sqft · built 1950 · 0.158 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $19,1532025 | —May 1995 | 2 Owners on Record Owner Occupied | AssessorUpdated Jun 2026 |
2 ba · 1,371 sqft · built 1950 · 0.154 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $522,000Jan 2008 | $15,4452025 | Amount on Record Oct 2004 | 2 Owners on Record Owner Occupied | AssessorUpdated Oct 2026 |
1 ba · 1,190 sqft · built 1950 · 0.154 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $13,1842025 | Owner on Record Owner Occupied | AssessorUpdated Jun 2026 |
2 ba · 1,700 sqft · built 1951 · 0.154 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $250,000Nov 2007 | $16,9522025 | —Aug 1998 | 2 Owners on Record Owner Occupied | AssessorUpdated Jun 2026 |
2.5 ba · 1,748 sqft · built 1951 · 0.154 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $20,5002025 | Owner on Record Owner Occupied | Assessor + 2 DocumentsUpdated Jun 2026 |
2 ba · 1,743 sqft · built 1950 · 0.154 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $9,8052025 | Owner on Record Owner Occupied | AssessorUpdated Jun 2026 |
3.5 ba · 2,688 sqft · built 2023 · 0.154 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $1,200,000Aug 2023 | $10,6132025 | Amount on Record Dec 2021 | Owner on Record Owner Occupied | Assessor + 2 DocumentsUpdated Oct 2026 |
2 ba · 1,877 sqft · built 1954 · 0.154 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $17,8662025 | 2 Owners on Record Owner Occupied | AssessorUpdated Jun 2026 |
2 ba · 2,351 sqft · built 1954 · 0.154 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $310,000Nov 2001 | $19,0912025 | 2 Owners on Record Owner Occupied | AssessorUpdated Jun 2026 |
2 ba · 2,249 sqft · built 1954 · 0.22 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $21,0692025 | 2 Owners on Record Owner Occupied | Assessor + 1 DocumentUpdated Jun 2026 |
3.5 ba · 2,527 sqft · built 2022 · 0.154 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $1,200,000May 2022 | $10,6132025 | Amount on Record May 2021 | 2 Owners on Record Owner Occupied | Assessor + 2 DocumentsUpdated Oct 2026 |
3.5 ba · 2,057 sqft · built 1954 · 0.162 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $1,238,888Nov 2025 | $19,0592025 | Amount on Record Nov 2020 | 2 Owners on Record Owner Occupied | Assessor + 4 DocumentsUpdated Oct 2026 |
4.5 ba · 3,121 sqft · built 2019 · 0.226 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $1,153,000Jul 2020 | $22,8272025 | Amount on Record Jul 2018 | Owner on Record Owner Occupied | Assessor + 2 DocumentsUpdated Oct 2026 |
2 ba · 1,928 sqft · built 1954 · 0.156 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $799,000Sep 2024 | $11,0532025 | 2 Owners on Record Owner Occupied | AssessorUpdated Oct 2026 |
2 ba · 2,177 sqft · built 1954 · 0.19 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $500,000Jul 2006 | $23,3922025 | 2 Owners on Record Owner Occupied | Assessor + 1 DocumentUpdated Jun 2026 |
2.5 ba · 1,917 sqft · built 1975 · 0.16 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $218,381Jul 1996 | $23,2352025 | Owner on Record Owner Occupied | AssessorUpdated Jun 2026 |
2 ba · 1,529 sqft · built 1954 · 0.16 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $935,000Nov 2024 | $17,2032025 | 2 Owners on Record | AssessorUpdated Jun 2026 |
2 ba · 1,409 sqft · built 1955 · 0.137 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $440,000Oct 2007 | $17,1122025 | Owner on Record Owner Occupied | AssessorUpdated Jun 2026 |
1 ba · 1,697 sqft · built 1954 · 0.149 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| —Mar 1997 | $15,9232025 | 2 Owners on Record Owner Occupied | Assessor + 1 DocumentUpdated Jun 2026 |
4 bd · 2 ba · 1,575 sqft · built 1955 · 0.137 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $628,000Apr 2018 | $17,8972025 | Amount on Record Oct 2013 | 2 Owners on Record Owner Occupied | Assessor + 2 DocumentsUpdated Oct 2026 |
4 bd · 2.5 ba · 1,713 sqft · built 1954 · 0.149 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $527,500Feb 2012 | $19,7472025 | Amount on Record Mar 2000 | Owner on Record Owner Occupied | Assessor + 2 DocumentsUpdated Oct 2026 |
3 ba · 2,124 sqft · built 1955 · 0.202 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $18,7102025 | Owner on Record Owner Occupied | Assessor + 1 DocumentUpdated Sep 2026 |
2 ba · 1,733 sqft · built 1955 · 0.16 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $365,000Jan 2000 | $18,4632025 | Amount on Record Aug 1995 | 2 Owners on Record Owner Occupied | AssessorUpdated Oct 2026 |
2 ba · 1,381 sqft · built 1954 · 0.149 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $410,000Jul 2010 | $17,6112025 | Amount on Record May 2006 | Owner on Record Owner Occupied | Assessor + 2 DocumentsUpdated Oct 2026 |
2 ba · 1,289 sqft · built 1955 · 0.153 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $16,3902025 | 2 Owners on Record Owner Occupied | AssessorUpdated Jun 2026 |
2 ba · 1,522 sqft · built 1954 · 0.149 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $16,3872025 | Owner on Record Owner Occupied | Assessor + 1 DocumentUpdated Jun 2026 |
1.5 ba · 1,601 sqft · built 1955 · 0.149 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $17,0462025 | 2 Owners on Record Owner Occupied | Assessor + 1 DocumentUpdated Jun 2026 |
2 ba · 2,231 sqft · built 1955 · 0.16 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $450,000Jan 2011 | $20,5662025 | 2 Owners on Record Owner Occupied | Assessor + 1 DocumentUpdated Oct 2026 |
2 ba · 1,457 sqft · built 1955 · 0.149 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $690,000Nov 2018 | $17,5762025 | Amount on Record Nov 2002 | 2 Owners on Record Owner Occupied | Assessor + 2 DocumentsUpdated Oct 2026 |
2 ba · 1,940 sqft · built 1954 · 0.149 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $329,000Nov 2001 | $17,9882025 | 2 Owners on Record Owner Occupied | AssessorUpdated Jun 2026 |
1 ba · 1,071 sqft · built 1955 · 0.167 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| —Jun 2017 | $13,2302025 | Owner on Record Owner Occupied | Assessor + 2 DocumentsUpdated Jun 2026 |
2.5 ba · 1,720 sqft · built 1954 · 0.205 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $18,9302025 | 2 Owners on Record Owner Occupied | AssessorUpdated Jun 2026 |
2 ba · 1,930 sqft · built 1954 · 0.207 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $21,7882025 | Owner on Record Owner Occupied | AssessorUpdated Jun 2026 |
1.5 ba · 1,395 sqft · built 1955 · 0.167 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $16,0732025 | Owner on Record Owner Occupied | Assessor + 1 DocumentUpdated Jun 2026 |
2 ba · 2,034 sqft · built 1954 · 0.185 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| —Jun 2001 | $18,5222025 | Owner on Record Owner Occupied | AssessorUpdated Jun 2026 |
1 ba · 1,393 sqft · built 1954 · 0.137 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $660,000Oct 2021 | $15,7942025 | 2 Owners on Record Owner Occupied | Assessor + 1 DocumentUpdated Jun 2026 |
2 ba · 1,619 sqft · built 1955 · 0.149 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $505,000Nov 2004 | $17,6112025 | 2 Owners on Record Owner Occupied | Assessor + 1 DocumentUpdated Oct 2026 |
4 bd · 1 ba · 1,523 sqft · built 1954 · 0.149 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $430,000Oct 2003 | $18,2112025 | Owner on Record Owner Occupied | AssessorUpdated Jun 2026 |
2 ba · 1,321 sqft · built 1955 · 0.149 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $371,000Jul 2002 | $17,2382025 | —Apr 1997 | Owner on Record Owner Occupied | AssessorUpdated Jun 2026 |
2 ba · 1,810 sqft · built 1954 · 0.165 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $610,000Feb 2006 | $21,1322025 | 2 Owners on Record Owner Occupied | Assessor + 3 DocumentsUpdated Jun 2026 |
5 bd · 2.5 ba · 1,313 sqft · built 1955 · 0.149 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $700,000Jan 2019 | $17,1752025 | Amount on Record Feb 2016 | 2 Owners on Record Owner Occupied | Assessor + 5 DocumentsUpdated Jun 2026 |
2 ba · 1,750 sqft · built 1954 · 0.16 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $17,6432025 | 2 Owners on Record Owner Occupied | AssessorUpdated Jun 2026 |