303 Atherton Ave, Atherton, CA 94027 Property Records

San Mateo County property record for 303 Atherton Ave, Atherton, CA 94027

Property Summary

Property Type	Single Family Home
Details	7 bd · 8.5 ba · 11,660 sqft · built 1985
Lot Size	1.06 acres (46,577 sqft)
Owner	2 Trust Names on File
Last Sale	$12,500,000 (Dec 2023)
Tax Bill	$141,207 (2025)
Deeds & Mortgages	Sep 2025 Mortgage Dec 2023 Transfer + 1 more
Flood Zone	Zone X (minimal risk)
APN	`073-220-250`

Property Details

APN / Parcel Number

Primary APN	`073-220-250`

Interior

Bedrooms	7 Beds
Full Baths	8.5 Baths
Half Baths	1 Half Bath
Total Rooms	18 Rooms
Stories	2 Stories
Building Area	11,660 sqft Living Area
Gross Area	13,100 sqft
1st Floor Area	3,570 sqft
2nd Floor Area	3,570 sqft
Attic	Attic
Attic Area	100 sqft
Basement Area	3,260 sqft
Finished Basement	1,920 sqft
Unfinished Basement	1,340 sqft
Family Room	Family Room
Study	Study

Exterior

Year Built	Built 1985
Effective Year Built	Effective 1985
Lot Area	46,577 sqft
Lot Dimensions	6,784 ft deep x 6,784 ft wide
View / Lot	Corner
Garage Type	Basement
Garage Area	1,340 sqft
Parking Spaces	5 Parking Spaces

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Central

Location & Zoning

Street Address	303 ATHERTON AVE
City	ATHERTON
State	CA
Zip	94027-6403
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	R10000
Legal Description	PARCEL B 1.136 AC MOL PARCEL MAP VOL 55/43
Legal Subdivision	BROAD ACRES
Legal Block	1
Jurisdiction	SAN MATEO CA
Township / Civil Division	SAN MATEO
Census Block Group	3
Census Block	3005
Census Tract	611400

Owner

303 Atherton Ave is owner-occupied and held in a trust since December 2023.

Source: San Mateo County records, as of July 15, 2026

Owner of Record	2 Trust Names on File
Mailing Address	303 ATHERTON AVE, ATHERTON, CA 94027-6403
Occupancy	Owner Occupied
Owner Type	Company
Vesting	Trust, Family Trust

Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.

Deeds, Mortgages & Sale History

Date	Document
Sep 9, 2025	Deed of Trust, Mortgage · Conventional Mortgage AXOS BANK
Dec 26, 2023	Intrafamily Transfer, Transfer LAWYERS TITLE COMPANY/CA, LAWYERS TITLE COMPANY
Dec 22, 2023	Grant Deed, Transfer · Conventional Mortgage AXOS BANK

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Dec 22, 2023 · Amount on File
Deed Sale	Dec 22, 2023 · Amount on File
Prior Sale	Feb 20, 2015 · Amount on File
Deed Document Number	202367802
Prior Transfer Date	Sep 1, 2006
Prior Transfer Doc	0000142060
Record Updated	Oct 29, 2026

September 2025: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	SAN MATEO CA
Property Address	303 ATHERTON AVE, ATHERTON, CA 94027-6403
Transaction Type	Mortgage
Record Updated	Jun 8, 2026
Title Company	ACCOMODATION, ACCOMMODATION

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	303 ATHERTON AVE, ATHERTON, CA 94027-6403

Mortgage

Document Number	0000046577
Date	Sep 9, 2025
Instrument	2025-046577

Lender

Name	AXOS BANK
Type	Bank
Address	SAN DIEGO, CA 92122

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	361 Months
Due	Oct 1, 2055

Interest

Rate Type	Adjustable Rate
Rate	7.62%
Type Change Date	Oct 1, 2030
Change Frequency	6 Months
Min Rate At Change	7.62%
Max Rate At Change	12.6%
Index	SOFR Average 30-Day
Max Rate	12.6%

December 2023: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	SAN MATEO CA
Recording Date	Dec 26, 2023
Property Address	303 ATHERTON AVE, ATHERTON, CA 94027-6403
Document Number	0000067973
Map Reference	MB 27 PG 35&36
Instrument Date	Dec 21, 2023
Instrument	2023-067973
Transaction Type	Transfer
Record Updated	Feb 5, 2024
Title Company	LAWYERS TITLE COMPANY/CA, LAWYERS TITLE COMPANY

Transaction

Tax	$0.00
Amount Accuracy	Transfer Tax Exempt
Additional	Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Family Trust
Address	303 ATHERTON AVE, ATHERTON, CA 94027-6403

December 2023: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	SAN MATEO CA
Recording Date	Dec 22, 2023
Property Address	303 ATHERTON AVE, ATHERTON, CA 94027-6403
Document Number	0000067802
Map Reference	MB 27 PG 35&36
Instrument Date	Dec 19, 2023
Instrument	2023-067802
Transaction Type	Transfer
Record Updated	Feb 5, 2024
Title Company	LAWYERS TITLE COMPANY/CA, LAWYERS TITLE COMPANY

Transaction

Amount	Amount on Record
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$13,750.00
Amount Accuracy	Rounded by County
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Community Property with Right of Survivorship
Address	303 ATHERTON AVE, ATHERTON, CA 94027-6403

Mortgage

Document Number	0000067803
Date	Dec 22, 2023
Instrument	2023-067803

Lender

Name	AXOS BANK
Type	Bank

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	361 Months
Due	Jan 1, 2054

Interest

Rate Type	Adjustable Rate
Rate	8.37%
Type Change Date	Jan 1, 2029
Change Frequency	6 Months
Min Rate At Change	8.37%
Max Rate At Change	13.3%
Margin	4
Max Rate	13.3%

Tax Assessment & Valuation

The 2025 property tax bill for 303 Atherton Ave was $141,207 with a homeowner's exemption.

Source: San Mateo County assessment roll, as of July 15, 2026

Property Jurisdictions

Type	Name
State	California
Municipality	Atherton Town
County	San Mateo County
Elementary School District	Las Lomitas Elementary School District (KG - 08)
Secondary School District	Sequoia Union High School District (09 - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value
2026		$13,622,000 (+6.84%) Land $5,722,200 Building $7,899,800
2025	$141,207.00	$12,750,000 Land $5,610,000 Building $7,140,000
2023	$95,057.00 (+2.82%)	$8,436,907 Land $3,748,559 Building $4,688,348
2022	$92,446.00

Assessed value is set for property tax purposes and is not a market price estimate.

Flood

FEMA maps place 303 Atherton Ave in Zone X, an area of minimal flood risk, though there have been 1 flood claim nearby since 2022.

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
Flood Insurance Cost	Premium on File median of 10 policies
Nearby Flood Policies	10 in force
Nearby Flood Claims	1 (2022)
Claims Outside the SFHA	1 of 1
Most Recent Claim	Dec 2022 · Severe Winter Storms, Flooding, Landslides, 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.

Wildfire

Wildfire risk around 303 Atherton 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 98% of the US · lower than 98.4% 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.

Drinking Water

Source: EPA Safe Drinking Water Information System, as of September 2026

Water System	CALIFORNIA WATER SERVICE - BEAR GULCH private · serves 60,382 people · EPA ID CA4110006
Water Source	Surface water
Last State Inspection	Feb 2025
Lead	4 ppb (2022–2024) action level 15 ppb

Violations Reported to EPA

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.

Internet Providers

Source: FCC Broadband Data Collection, based on 136 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
Race Communications 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
Verizon Fixed Wireless	300 / 20

May also be available: Etheric Networks.

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