San Mateo County property record for 617 Sylvan Ave, San Mateo, CA 94403
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2 ba · 1,860 sqft · built 1946 |
| Lot Size | 0.153 acres (6,675 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $1,731,000 (Mar 2020) |
| Tax Bill | $23,265 (2025) |
| Deeds & Mortgages | Jun 2020 Mortgage Mar 2020 Sale & Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 039-303-030 |
| Primary APN | 039-303-030 |
|---|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 6 Rooms |
| Stories | 1 Story |
| Building Area | 1,860 sqft Living Area |
| 1st Floor Area | 1,130 sqft |
| Basement Area | 310 sqft |
| Finished Basement | 310 sqft |
| Family Room | Family Room |
| Year Built | Built 1946 |
|---|---|
| Effective Year Built | Effective 1946 |
| Lot Area | 6,675 sqft (0.153 acres) |
| Lot Dimensions | 111 ft deep x 60 ft wide |
| Garage Area | 230 sqft |
| Parking Spaces | 1 Parking Space |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 617 SYLVAN AVE |
|---|---|
| City | SAN MATEO |
| State | CA |
| Zip | 94403-3215 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R10006 |
| Legal Description | LOT 12 BLOCK 23 SAN MATEO TERRACE MAP NO 7 RSM 23/70 CITY OFSAN MATEO |
| Legal Subdivision | SAN MATEO TERRACE MAP NO 7 |
| Legal Block | 23 |
| Legal Lot Number | 12 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 3 |
| Census Block | 3001 |
| Census Tract | 607300 |
617 Sylvan Ave is owned and occupied by two individuals who bought it in March 2020.
Source: San Mateo County records, as of July 15, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 617 SYLVAN AVE, SAN MATEO, CA 94403-3215 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Date | Document |
|---|---|
| Jun 29, 2020 | Deed of Trust, Mortgage · Conventional Mortgage GUARANTEED RATE AFFINITY LLC |
| Mar 16, 2020 | Grant Deed, Transfer · Conventional Mortgage GUARANTEED RATE AFFINITY LLC |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Mar 16, 2020 · Amount on File |
| Deed Sale | Mar 16, 2020 · Amount on File |
| Prior Sale | Sep 10, 2013 · Amount on File |
| Deed Document Number | 202023612 |
| Prior Transfer Date | Sep 1, 2013 |
| Prior Transfer Doc | 0000157539 |
| Record Updated | Oct 29, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Property Address | 617 SYLVAN AVE, SAN MATEO, CA 94403-3215 |
| Transaction Type | Mortgage |
| Record Updated | Oct 18, 2022 |
| Name | Verified Name |
|---|
| Document Number | 0000060897 |
|---|---|
| Date | Jun 29, 2020 |
| Instrument | 2020-060897 |
| Name | GUARANTEED RATE AFFINITY LLC |
|---|---|
| Type | Mortgage Company |
| Address | CHICAGO, IL 60613 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 361 Months |
| Due | Jul 1, 2050 |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Recording Date | Mar 16, 2020 |
| Property Address | 617 SYLVAN AVE, SAN MATEO, CA 94403-3215 |
| Document Number | 0000023612 |
| Map Reference | MB 23 PG 70 |
| Instrument Date | Mar 11, 2020 |
| Instrument | 2020-023612 |
| Transaction Type | Transfer |
| Record Updated | Oct 18, 2022 |
| Title Company | FIRST AMERICAN TITLE COMPANY |
| Amount | Amount on Record |
|---|---|
| Downpayment | Downpayment on Record |
| Loan-to-Value (LTV) | LTV on Record |
| Tax | $10,559.10 |
| Amount Accuracy | Rounded by County |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Community Property with Right of Survivorship |
| Address | 617 SYLVAN AVE, SAN MATEO, CA 94403-3215 |
| Document Number | 0000023613 |
|---|---|
| Date | Mar 16, 2020 |
| Instrument | 2020-023613 |
| Name | GUARANTEED RATE AFFINITY LLC |
|---|---|
| Type | Mortgage Company |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 361 Months |
| Due | Apr 1, 2050 |
The 2025 property tax bill for 617 Sylvan Ave was $23,265.
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 | $1,930,959 (+2%) Land $1,171,292 Building $759,667 | ||
| 2025 | $23,265.00 | $1,893,098 Land $1,148,326 Building $744,772 | |
| 2023 | $22,502.00 (+1.44%) | $1,819,588 Land $1,103,736 Building $715,852 | $2,065,860 |
| 2022 | $22,183.00 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 617 Sylvan Ave in Zone X, an area of minimal flood risk, though there have been 2 flood claims nearby since 2009.
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.
The area around 617 Sylvan Ave has no burnable land within ember reach, so its wildfire risk is not rated.
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 732 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, T-Mobile.
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