San Mateo County property record for 421 Sylvan Ave, San Mateo, CA 94403 · Last verified July 2026
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 1 ba · 1,200 sqft · built 1940 |
| Lot Size | 0.126 acres (5,500 sqft) |
| Owner | 2 Company Names on File |
| Tax Bill | $5,039 (2025) |
| Deeds & Mortgages | Jul 2021 Transfer |
| Flood Zone | Zone X (minimal risk) |
| APN | 039-311-060 |
| Primary APN | 039-311-060 |
|---|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 1 Bath |
| Total Rooms | 6 Rooms |
| Stories | 1 Story |
| Building Area | 1,200 sqft Living Area |
| 1st Floor Area | 1,200 sqft |
| Family Room | Family Room |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1940 |
|---|---|
| Effective Year Built | Effective 1940 |
| Architectural Style | Bungalow |
| Exterior Material | Stucco |
| Construction Type | Frame |
| Roof Material | Composition Shingle |
| Lot Area | 5,500 sqft (0.126 acres) |
| Lot Dimensions | 110 ft deep x 50 ft wide |
| Garage Area | 270 sqft |
| Parking Spaces | 1 Parking Space |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Sewer | Municipal |
| Water Source | Commercial |
| Street Address | 421 SYLVAN AVE |
|---|---|
| City | SAN MATEO |
| State | CA |
| Zip | 94403-3333 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT 6 BLOCK 14 SAN MATEO TERRACE MAP NO 5 RSM 22/35 CITY OF SAN MATEO |
| Legal Subdivision | SAN MATEO TERRACE MAP NO 5 |
| Legal Block | 14 |
| Legal Lot Number | 6 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 2 |
| Census Block | 2015 |
| Census Tract | 607300 |
Source: San Mateo County records · APN 039-311-060
Assessment roll updated July 15, 2026 · Last verified July 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | 2 Company Names on File |
|---|---|
| Mailing Address | 421 SYLVAN AVE, SAN MATEO, CA 94403-3333 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust |
| Deed Names | 2 Verified Names on Deed |
|---|---|
| Last Transfer Date | Jul 14, 2021 |
| Transfer Doc | 0000111797 |
| Record Updated | Sep 20, 2026 |
| Document Type | Intrafamily Transfer |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Recording Date | Jul 28, 2021 |
| Property Address | 421 SYLVAN AVE, SAN MATEO, CA 94403-3333 |
| Document Number | 0000111797 |
| Map Reference | MB 22 PG 35 |
| Instrument Date | Jul 14, 2021 |
| Instrument | 2021-111797 |
| Transaction Type | Transfer |
| Record Updated | Jun 07, 2023 |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | Transfer Tax Exempt |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Revocable Trust |
| Address | 421 SYLVAN AVE, SAN MATEO, CA 94403-3333 |
Source: San Mateo County records · Assessment roll updated July 15, 2026 · Last verified July 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) |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $324,165 (+2%) Land $150,976 Building $173,189 | ||
| 2025 | $5,039.00 (+6.08%) Homeowner's exemption | $317,810 (+4.04%) Land $148,016 Building $169,794 | |
| 2023 | $4,750.00 (+1.95%) Homeowner's exemption | $305,470 Land $142,269 Building $163,201 | $1,815,300 |
| 2022 | $4,659.00 |
Source: FEMA National Flood Hazard Layer, San Mateo County (06081C), updated September 10, 2026 · FEMA OpenFEMA NFIP redacted claims and policies, census block group 060816073002, refreshed September 2026 · USDA Forest Service Wildfire Risk to Communities, 2nd edition (2024), fuels as of 2020 · Last verified October 2026
| FEMA Flood Zone | Zone X |
|---|---|
| Special Flood Hazard Area | No |
| Flood Hazard | Minimal |
| 500-Year Floodplain | No |
| Nearby Flood Policies | 2 in force |
| Nearby Flood Claims | 4 (1998–2022) |
| Claims Outside the SFHA | 4 of 4 |
| Most Recent Claim | Dec 2022, rainfall accumulation |
| Wildfire Risk | Not rated no burnable land in reach |
|---|---|
| Wildfire Likelihood | Negligible |
| Exposure | None beyond ember reach |
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: FCC Broadband Data Collection, availability as of December 31, 2025 · Published October 2026 · based on 716 locations within about half a mile of this property
| Provider | Technology | Download / Upload (Mbps) |
|---|---|---|
| Sonic Telecom | Fiber | 10,000 / 10,000 |
| AT&T | Fiber | 5,000 / 5,000 |
| Xfinity | Cable | 2,000 / 250 |
| Radiate Holdings | Cable | 1,500 / 50 |
May also be available at this address: T-Mobile USA, AT&T, Etheric Communications, LLC., Radiate Holdings, California Internet. Availability varies by address; speeds are provider-advertised maximums, not measured.
5G and 4G LTE
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