Nassau County and Oyster Bay Town property records for 16 addresses on Underhill Blvd, Syosset, NY · Last verified October 2026
| Properties | 16 |
|---|---|
| Median Sale Price | $2,100,000 |
| Deeds and Mortgages on File | 23 |
| Median Price per Sqft | $142 |
| Owner Occupied | 50% |
| Median Annual Tax Bill | $47,347 |
| Median Year Built | 1963 |
| Median Ownership Tenure | 8 years |
Owner names and prior sale amounts shown locked below are available instantly with a free trial.
1,566 sqft · built 1958 · 0.286 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $1,540,000Feb 2026 | $21,8242025 | Amount on Record May 2009 | Owner on Record | Assessor + 1 DocumentUpdated Oct 2026 |
0.018 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $1,500,000Oct 2020 | $1,3912025 | —Nov 2001 | Owner on Record | Assessor + 1 DocumentUpdated Oct 2026 |
21,855 sqft · built 1964 · 0.258 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $2,100,000Jan 2025 | $83,1012025 | Owner on Record Owner Occupied | AssessorUpdated Jun 2026 |
30,628 sqft · built 1985 · 0.635 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $1,900,000Dec 2018 | Amount on Record Apr 2001 | Owner on Record | Assessor + 2 DocumentsUpdated Oct 2026 |
2,482 sqft · built 1959 · 0.535 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| —Oct 2014 | $30,0812025 | —Oct 2014 | Owner on Record Owner Occupied | AssessorUpdated Jun 2026 |
1,585 sqft · built 1949 · 0.108 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| —Feb 2016 | $9,2722025 | Owner on Record | AssessorUpdated Jun 2026 |
4,734 sqft · built 1929 · 0.564 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $1,250,000May 2019 | $47,3472025 | —Jun 1996 | Owner on Record Owner Occupied | Assessor + 1 DocumentUpdated Aug 2026 |
47,560 sqft · built 1962 · 0.797 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $87,7132025 | Owner on Record | AssessorUpdated Jun 2026 |
103,136 sqft · built 1963 · 5.58 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $314,5032025 | Owner on Record | AssessorUpdated Jun 2026 |
63,400 sqft · built 2003 · 4.36 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $17,694,245Nov 2006 | Amount on Record May 2003 | Owner on Record Owner Occupied | Assessor + 3 DocumentsUpdated Jun 2026 |
41,800 sqft · built 2007 · 1.5 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $5,973,000Jun 2008 | Owner on Record Owner Occupied | Assessor + 3 DocumentsUpdated Jun 2026 |
303,842 sqft · built 1962 · 9.08 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $31,900,000Nov 2006 | Amount on Record Aug 1997 | Owner on Record Owner Occupied | Assessor + 3 DocumentsUpdated Oct 2026 |
80,100 sqft · built 1963 · 3.76 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $8,600,000Mar 2019 | Owner on Record Owner Occupied | Assessor + 2 DocumentsUpdated Oct 2026 |
101,820 sqft · built 1963 · 3.48 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $15,675,000Mar 2026 | $20,4152026 | Owner on Record | Assessor + 1 DocumentUpdated Aug 2026 |
71,778 sqft · built 1985 · 1.98 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $8,100,000Jul 2006 | $267,1552025 | —Apr 1999 | Owner on Record | AssessorUpdated Oct 2026 |
260,315 sqft · built 1956 · 16.5 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $21,471,255Dec 2000 | Amount on Record Feb 1997 | Owner on Record Owner Occupied | Assessor + 6 DocumentsUpdated Oct 2026 |