Santa Clara County property record for 1231 Isabelle Ave, Mountain View, CA 94040
| Property Type | Single Family Home |
|---|---|
| Details | 2 bd · 1 ba · 1,230 sqft · built 1949 |
| Lot Size | 0.257 acres (11,200 sqft) |
| Owner | Trust Name on File |
| Tax Bill | $1,273 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 189-04-043 |
| Primary APN | 189-04-043 |
|---|
| Bedrooms | 2 Beds |
|---|---|
| Full Baths | 1 Bath |
| Total Rooms | 6 Rooms |
| Stories | 1 Story |
| Building Area | 1,230 sqft Living Area |
| 1st Floor Area | 1,230 sqft |
| Family Room | Family Room |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1949 |
|---|---|
| Effective Year Built | Effective 1949 |
| Architectural Style | Custom Design |
| Construction Type | Wood |
| Lot Area | 11,200 sqft (0.257 acres) |
| Lot Dimensions | 150 ft deep x 80 ft wide |
| Garage Area | 567 sqft |
| Parking Spaces | 2 Parking Spaces |
| Porch | Porch |
| Cooling System | None |
|---|
| Street Address | 1231 ISABELLE AVE |
|---|---|
| City | MOUNTAIN VIEW |
| State | CA |
| Zip | 94040-3035 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R1-8L |
| Legal Description | TRACT 261 BROOKDALE BOOK 13 PAGE 10 PAGE 11 LOT 73 |
| Legal Subdivision | BROOKDALE |
| Legal Tract | 261 |
| Legal Lot Number | 73 |
| Jurisdiction | SANTA CLARA CA |
| Township / Civil Division | SAN JOSE |
| Census Block Group | 3 |
| Census Block | 3013 |
| Census Tract | 509801 |
1231 Isabelle Ave is owner-occupied and held in a trust since May 2013.
Source: Santa Clara County records, as of July 27, 2026
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Owner of Record | Trust Name on File |
|---|---|
| Mailing Address | 1231 ISABELLE AVE, MOUNTAIN VIEW, CA 94040-3035 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust |
| Deed Names | Name on Deed |
|---|---|
| Last Transfer Date | May 7, 2013 |
| Transfer Doc | 0022252143 |
| Record Updated | Sep 20, 2026 |
The 2025 property tax bill for 1231 Isabelle Ave was $1,273 with a homeowner's exemption.
Source: Santa Clara County assessment roll, as of July 27, 2026
| Type | Name |
|---|---|
| State | California |
| County | Santa Clara County |
| Municipality | Mountain View City |
| Elementary School District | Mountain View Whisman Elementary School District (KG - 08) |
| Secondary School District | Mountain View-Los Altos Union School District (09 - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $91,131 (+2%) Land $49,920 Building $41,211 | |
| 2025 | $1,273.00 Homeowner's exemption | $89,345 Land $48,942 Building $40,403 |
| 2023 | $1,242.00 (+0.65%) Homeowner's exemption | $85,878 Land $47,043 Building $38,835 |
| 2022 | $1,234.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 1231 Isabelle Ave in Zone X, an area of minimal flood risk, within 100 ft of a high-risk flood zone.
Source: FEMA National Flood Hazard Layer, effective January 18, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Nearest Special Flood Hazard Area | Zone AE, within 100 ft |
| Flood Insurance Requirement | Not required lenders may require it |
| Community Rating System | Class 7 (15% premium discount) |
| Nearby Flood Policies | 8 in force |
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.
Wildfire risk around 1231 Isabelle Ave is low, with less than a 0.01% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 99.1% of the US · lower than 99.2% of California |
|---|---|
| Wildfire Likelihood | Under 0.01% annual chance |
| Exposure | None beyond 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 | CWSC LOS ALTOS SUBURBAN private · serves 63,559 people · EPA ID CA4310001 |
|---|---|
| Water Source | Purchased surface water from several systems |
| Last State Inspection | Aug 2024 |
| Lead | 2 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 615 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| AT&T Fiber · DSL · Fixed Wireless in parts of the area | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
| Cruzio Fixed Wireless | 1,000 / 1,000 |
| Verizon Fixed Wireless | 300 / 20 |
| Etheric Networks Fixed Wireless | 250 / 100 |
| Ridge Wireless Fixed Wireless | 100 / 60 |
| T-Mobile Fixed Wireless | 100 / 20 |
May also be available: Astound Broadband, GeoLinks.
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