Nassau County and Oyster Bay Town property records for 15 addresses on Alden Ave, Syosset, NY · Last verified October 2026
| Properties | 15 |
|---|---|
| Median Sale Price | $475,000 |
| Deeds and Mortgages on File | 17 |
| Median Price per Sqft | $331 |
| Owner Occupied | 100% |
| Median Annual Tax Bill | $18,260 |
| Median Year Built | 1955 |
| Median Ownership Tenure | 23 years |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
1 Alden Ave |
2 ba · 1,660 sqft built 1954 · 0.172 acres | $340,000 Jul 2001 | $18,952 2025 | Assessor + 1 Document Updated Jun 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
2 Alden Ave |
2 ba · 1,700 sqft built 1957 · 0.189 acres | $235,000 Aug 2000 | $18,553 2025 | Assessor + 1 Document Updated Jun 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
3 Alden Ave |
3 ba · 2,524 sqft built 1954 · 0.158 acres | $665,000 Feb 2008 | $21,379 2025 | Assessor + 2 Documents Updated Jun 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
4 Alden Ave |
2 ba · 2,049 sqft built 1954 · 0.144 acres | $140,000 Aug 1993 | $18,260 2025 | Assessor Updated Jun 2026 | Owner on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
5 Alden Ave |
4 ba · 2,543 sqft built 1962 · 0.137 acres | $930,000 Feb 2021 | $22,419 2025 | Assessor + 4 Documents Updated Oct 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
7 Alden Ave |
2 ba · 1,435 sqft built 1954 · 0.137 acres | $475,000 Jul 2003 | $17,929 2025 | Assessor + 1 Document Updated Oct 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
9 Alden Ave |
3 ba · 2,263 sqft built 1954 · 0.137 acres | $342,000 Apr 2001 | $20,849 2025 | Assessor Updated Jun 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
11 Alden Ave |
2 ba · 1,510 sqft built 1954 · 0.137 acres | $285,000 Apr 1999 | $17,329 2025 | Assessor Updated Jun 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
15 Alden Ave |
4 ba · 2,646 sqft built 1954 · 0.137 acres | $1,098,000 Sep 2021 | $17,364 2025 | Assessor + 2 Documents Updated Oct 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
16 Alden Ave |
2 ba · 1,634 sqft built 1955 · 0.141 acres | $20,155 2025 | Assessor Updated Jun 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
17 Alden Ave |
2 ba · 1,349 sqft built 1955 · 0.139 acres | $350,000 Jun 2001 | $16,198 2025 | Assessor Updated Jun 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
18 Alden Ave |
3 ba · 2,356 sqft built 1955 · 0.138 acres | $281,000 May 1998 | $19,778 2025 | Assessor + 1 Document Updated Jun 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
19 Alden Ave |
1 ba · 1,382 sqft built 1955 · 0.141 acres | — Jun 2022 | $13,836 2025 | Assessor + 2 Documents Updated Jun 2026 | Owner on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
20 Alden Ave |
3 ba · 2,436 sqft built 1955 · 0.138 acres | $439,000 Feb 2011 | $16,767 2025 | Assessor + 3 Documents Updated Oct 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
21 Alden Ave |
3 bd · 2 ba · 1,111 sqft built 1955 · 0.143 acres | $400,000 Sep 2012 | $13,974 2025 | Assessor Updated Jun 2026 | Owner on File Owner Occupied |