San Mateo County property record for 2139 Isabelle Ave, San Mateo, CA 94403
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 1 ba · 1,260 sqft · built 1940 |
| Lot Size | 0.236 acres (10,267 sqft) |
| Owner | 2 Company Names on File |
| Tax Bill | $2,905 (2025) |
| Deeds & Mortgages | Aug 2022 Transfer |
| Flood Zone | Zone X (minimal risk) |
| APN | 039-052-200 |
| Primary APN | 039-052-200 |
|---|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 1 Bath |
| Total Rooms | 6 Rooms |
| Stories | 1 Story |
| Building Area | 1,260 sqft Living Area |
| Gross Area | 1,670 sqft |
| 1st Floor Area | 850 sqft |
| Basement Area | 410 sqft |
| Family Room | Family Room |
| Year Built | Built 1940 |
|---|---|
| Effective Year Built | Effective 1940 |
| Lot Area | 10,267 sqft (0.236 acres) |
| Lot Dimensions | 143 ft deep x 100 ft wide |
| Garage Area | 290 sqft |
| Parking Spaces | 1 Parking Space |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 2139 ISABELLE AVE |
|---|---|
| City | SAN MATEO |
| State | CA |
| Zip | 94403-1716 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R10006 |
| Legal Description | SLY 1/4 MOL OF LOT 6 BLOCK 4 BERESFORD MANOR RSM 13/44 45 CITY OF SAN MATEO |
| Legal Subdivision | BERESFORD MANOR |
| Legal Block | 4 |
| Legal Lot Number | 6 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 1 |
| Census Block | 1007 |
| Census Tract | 607400 |
Source: San Mateo County records · APN 039-052-200
Assessment roll updated July 15, 2026 · Last verified August 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 | 2139 ISABELLE AVE, SAN MATEO, CA 94403-1716 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust |
| Deed Names | 2 Verified Names on Deed |
|---|---|
| Last Transfer Date | Jun 16, 2022 |
| Transfer Doc | 0000062142 |
| Record Updated | Sep 20, 2026 |
| Document Type | Intrafamily Transfer |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Recording Date | Aug 19, 2022 |
| Property Address | 2139 ISABELLE AVE, SAN MATEO, CA 94403-1716 |
| Document Number | 0000062142 |
| Map Reference | MB 13 PG 44&45 |
| Instrument Date | Jul 16, 2022 |
| Instrument | 2022-062142 |
| Transaction Type | Transfer |
| Record Updated | Jun 07, 2023 |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | Transfer Tax Exempt |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Family Trust |
| Address | 2139 ISABELLE AVE, SAN MATEO, CA 94403-1716 |
Source: San Mateo County records · Assessment roll updated July 15, 2026 · Last verified August 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 | $115,129 (+2%) Land $40,029 Building $75,100 | ||
| 2025 | $2,905.00 (+10.25%) Homeowner's exemption | $112,873 (+4.04%) Land $39,245 Building $73,628 | |
| 2023 | $2,635.00 (+0.08%) Homeowner's exemption | $108,492 Land $37,722 Building $70,770 | $1,512,090 |
| 2022 | $2,633.00 |
Source: FEMA National Flood Hazard Layer as of September 10, 2026 · FEMA NFIP claims and policies as of September 2026 · USDA Forest Service Wildfire Risk to Communities as of 2024 · Last verified October 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Nearby Flood Policies | 1 in force |
| Wildfire Risk | Not rated no burnable land within 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 as of December 31, 2025 · Last verified October 2026
| 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 |
| Radiate Holdings Cable | 1,500 / 50 |
May also be available: California Internet, Etheric Communications, LLC., T-Mobile USA, Verizon.
Based on FCC filings for 799 locations within half a mile of this property.
Source: EPA Safe Drinking Water Information System as of 2026 Q3 · EPA water system boundaries as of March 2026 · Last verified October 2026
| Water System | CALIFORNIA WATER SERVICE - SAN MATEO private · serves 103,536 people |
|---|---|
| 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 as reported to EPA, not water tested at this address; lead at the tap also depends on the building's own pipes. The full violation and enforcement history is in the system's EPA record.
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