San Mateo County property record for 503 Sylvan Ave, San Mateo, CA 94403
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2.5 ba · 1,725 sqft · built 1946 |
| Lot Size | 0.128 acres (5,563 sqft) |
| Owner | 2 Individual Names on Record |
| Last Sale | $699,000 (Dec 2010) |
| Tax Bill | $16,079 (2025) |
| Deeds & Mortgages | Sep 2021 Line of Credit Jul 2020 Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 039-303-180 |
| Primary APN | 039-303-180 |
|---|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 6 Rooms |
| Stories | 1 Story |
| Building Area | 1,725 sqft Living Area |
| 1st Floor Area | 1,000 sqft |
| Family Room | Family Room |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1946 |
|---|---|
| Effective Year Built | Effective 1946 |
| Lot Area | 5,563 sqft (0.128 acres) |
| Lot Dimensions | 111 ft deep x 50 ft wide |
| Garage Area | 270 sqft |
| Parking Spaces | 1 Parking Space |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 503 SYLVAN AVE |
|---|---|
| City | SAN MATEO |
| State | CA |
| Zip | 94403-3213 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R10006 |
| Legal Description | LOT 11 BLOCK 18 SAN MATEO TERRACE MAP NO 5 RSM 22/35 CITY OFSAN MATEO |
| Legal Subdivision | SAN MATEO TERRACE MAP NO 5 |
| Legal Block | 18 |
| Legal Lot Number | 11 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 3 |
| Census Block | 3001 |
| Census Tract | 607300 |
Source: San Mateo County records, as of July 15, 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | 2 Individual Names on Record |
|---|---|
| Mailing Address | 503 SYLVAN AVE, SAN MATEO, CA 94403-3213 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Community Property |
| Date | Document |
|---|---|
| Sep 8, 2021 | Deed of Trust, Mortgage · Line of Credit BANK OF THE WEST |
| Jul 22, 2020 | Intrafamily Transfer, Transfer · Conventional Mortgage WELLS FARGO BANK NA |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Dec 14, 2010 · Amount on Record |
| Deed Sale | Dec 14, 2010 · Amount on Record |
| Prior Sale | Aug 23, 2006 · Amount on Record |
| Deed Document Number | 2010154146 |
| Last Transfer Date | Jul 16, 2020 |
| Transfer Doc | 0000070651 |
| Record Updated | Oct 29, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Property Address | 503 SYLVAN AVE, SAN MATEO, CA 94403-3213 |
| Transaction Type | Mortgage |
| Record Updated | Oct 18, 2022 |
| Name | Verified Name |
|---|---|
| Address | 503 SYLVAN AVE, SAN MATEO, CA 94403-3213 |
| Document Number | 0000129079 |
|---|---|
| Date | Sep 8, 2021 |
| Instrument | 2021-129079 |
| Name | BANK OF THE WEST |
|---|---|
| Type | Bank |
| Address | SAN MATEO, CA 94403 |
| Type | Line of Credit |
|---|---|
| Amount | Amount Recorded |
| Term | 360 Months |
| Due | Sep 1, 2051 |
| Rate Type | Adjustable Rate |
|---|---|
| Change Frequency | Monthly |
| Document Type | Intrafamily Transfer |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Recording Date | Jul 22, 2020 |
| Property Address | 503 SYLVAN AVE, SAN MATEO, CA 94403-3213 |
| Document Number | 0000070651 |
| Map Reference | MB 22 PG 35 |
| Instrument Date | Jul 16, 2020 |
| Instrument | 2020-070651 |
| Transaction Type | Transfer |
| Record Updated | Oct 18, 2022 |
| Title Company | OLD REPUBLIC TITLE COMPANY |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | Transfer Tax Exempt |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Community Property with Right of Survivorship |
| Address | 503 SYLVAN AVE, SAN MATEO, CA 94403-3213 |
| Document Number | 0000070652 |
|---|---|
| Date | Jul 22, 2020 |
| Instrument | 2020-070652 |
| Name | WELLS FARGO BANK NA |
|---|---|
| Type | Bank |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount Recorded |
| Term | 361 Months |
| Due | Aug 1, 2050 |
Source: San Mateo County assessment roll, as of July 15, 2026
| Type | Name |
|---|---|
| State | California |
| County | San Mateo County |
| Municipality | San Mateo City |
| Elementary School District | San Mateo-Foster City Elementary School District (KG - 08) |
| Secondary School District | San Mateo Union High School District (09 - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $1,273,184 (+2%) Land $456,718 Building $816,466 | ||
| 2025 | $16,079.00 (+5.98%) Homeowner's exemption | $1,248,221 (+4.04%) Land $447,763 Building $800,458 | |
| 2023 | $15,172.00 (+25.95%) Homeowner's exemption | $1,199,754 Land $430,377 Building $769,377 | $1,982,340 |
| 2022 | $12,046.00 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
Source: FEMA National Flood Hazard Layer, effective September 10, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Nearby Flood Policies | 2 in force |
| Nearby Flood Claims | 2 (2009–2017) |
| Claims Outside the SFHA | 2 of 2 |
| Most Recent Claim | Jan 2017 · Severe Winter Storms, Flooding, And Mudslides |
Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Not rated no burnable land within ember reach |
|---|
Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.
Source: EPA Safe Drinking Water Information System, as of September 2026
| Water System | CALIFORNIA WATER SERVICE - SAN MATEO private · serves 103,536 people · EPA ID CA4110008 |
|---|---|
| Water Source | Purchased surface water from SAN FRANCISCO REGIONAL WATER SYSTEM |
| Last State Inspection | Mar 2025 |
| Lead | 4 ppb (2023–2025) action level 15 ppb |
| Water Quality | None last 10 years |
|---|---|
| Treatment and Procedure | None last 10 years |
| Monitoring and Reporting | None last 3 years |
Results are for the whole water system, not water tested at this address; lead at the tap also depends on the building's own pipes.
Source: FCC Broadband Data Collection, based on 716 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Sonic Telecom Fiber | 10,000 / 10,000 |
| AT&T Fiber · Fixed Wireless, DSL in parts of the area | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
| Astound Broadband Cable · Fiber in parts of the area | 1,500 / 50 |
May also be available: Etheric Networks, GeoLinks, T-Mobile.
Search by:
By searching, you agree to: Terms • Privacy • Disclosures