San Mateo County property records for 9 addresses on E 21st Ave, San Mateo, CA · Last verified October 2026
| Properties | 9 |
|---|---|
| Median Sale Price | $1,150,000 |
| Deeds and Mortgages on File | 8 |
| Median Price per Sqft | $216 |
| Median Annual Tax Bill | $13,383 |
| Median Year Built | 1960 |
| Median Ownership Tenure | 11 years |
Owner names and prior sale amounts shown locked below are available instantly with a free trial.
11,000 sqft · built 1954 · 0.321 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $3,800,000Nov 2020 | $165,6122025 | Amount on Record Aug 2001 | Owner on Record | Assessor + 2 DocumentsUpdated Jul 2026 |
8,730 sqft · built 1977 · 0.358 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $1,886,500Dec 2007 | $36,6242025 | Amount on Record Jul 2007 | Owner on Record | Assessor + 1 DocumentUpdated Jul 2026 |
4,100 sqft · built 1977 · 0.158 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| —Jul 2015 | $4,8922025 | 2 Owners on Record | AssessorUpdated Jul 2026 |
0.114 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $1,550,000Apr 2024 | $20,0122025 | Owner on Record | Assessor + 3 DocumentsUpdated Jul 2026 |
8,740 sqft · built 1946 · 0.158 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $360,000Oct 1994 | $8,2752025 | —Oct 1994 | 2 Owners on Record | AssessorUpdated Jul 2026 |
0.057 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $1,150,000Jul 2026 | $2,9662025 | Amount on Record May 2025 | 2 Owners on Record | Assessor + 1 DocumentUpdated Aug 2026 |
0.153 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $725,000May 2006 | $13,3832025 | —Dec 2001 | 2 Owners on Record | AssessorUpdated Jul 2026 |
4,975 sqft · built 1960 · 0.114 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $650,000Dec 2011 | $14,1802025 | Amount on Record Jun 2011 | 2 Owners on Record | AssessorUpdated Oct 2026 |
9,150 sqft · built 1951 · 0.209 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $7,8022025 | Owner on Record | Assessor + 1 DocumentUpdated Aug 2026 |