33 Walnut Ave, Atherton, CA 94027 Property Records

San Mateo County property record for 33 Walnut Ave, Atherton, CA 94027

Property Summary

Property Type	Single Family Home
Details	3 bd · 2 ba · 2,004 sqft · built 1933
Lot Size	0.172 acres (7,500 sqft)
Owner	2 Individual Names on Record
Last Sale	$1,170,000 (Aug 2011)
Tax Bill	$21,115 (2025)
Deeds & Mortgages	Apr 2020 Line of Credit Apr 2020 Mortgage + 1 more
Flood Zone	Zone X (minimal risk)
APN	`060-331-110`

Property Details

APN / Parcel Number

Primary APN	`060-331-110`

Interior

Bedrooms	3 Beds
Full Baths	2 Baths
Total Rooms	8 Rooms
Stories	1 Story
Building Area	2,004 sqft Living Area
1st Floor Area	1,140 sqft
Family Room	Family Room
Study	Study

Exterior

Year Built	Built 1933
Effective Year Built	Effective 1933
Lot Area	7,500 sqft (0.172 acres)
Lot Dimensions	100 ft deep x 75 ft wide
Garage Type	Carport
Carport	Carport
Parking Spaces	1 Parking Space

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Central

Location & Zoning

Street Address	33 WALNUT AVE
City	ATHERTON
State	CA
Zip	94027-3820
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	R1001A
Legal Description	SW 25 FT X 100 FT OF LOT 29 & SW 50 FT 100 FT OF LOT 30 BLOCK A MENLO PARK VILLA LOTS RSM 1/93 TOWN OF ATHERTON
Legal Subdivision	MENLO PARK VILLA
Legal Block	A
Legal Lot Number	29,30
Jurisdiction	SAN MATEO CA
Township / Civil Division	SAN MATEO
Census Block Group	2
Census Block	2023
Census Tract	611500

Owner

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

Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.

Owner of Record	2 Individual Names on Record
Mailing Address	33 WALNUT AVE, ATHERTON, CA 94027-3820
Occupancy	Owner Occupied
Owner Type	Individual

Deeds, Mortgages & Sale History

Date	Document
Apr 24, 2020	Deed of Trust, Mortgage · Line of Credit TCF NATIONAL BANK
Apr 24, 2020	Deed of Trust, Mortgage · Conventional Mortgage GUARANTEED RATE AFFINITY LLC
Feb 16, 2021	Deed of Trust, Mortgage · Conventional Mortgage GUARANTEED RATE INC

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Aug 19, 2011 · Amount on Record
Deed Sale	Aug 19, 2011 · Amount on Record
Deed Document Number	201194848
Last Transfer Date	Oct 3, 2012
Transfer Doc	0000145615
Record Updated	Oct 29, 2026

April 2020: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	SAN MATEO CA
Property Address	33 WALNUT AVE, ATHERTON, CA 94027-3820
Transaction Type	Mortgage
Record Updated	Aug 5, 2022

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000037080
Date	Apr 24, 2020
Instrument	2020-037080

Lender

Name	TCF NATIONAL BANK
Type	Bank
Address	SIOUX FALLS, SD 57106

Agreement

Type	Line of Credit
Amount	Amount Recorded
Term	360 Months
Due	Apr 23, 2050

Interest

Rate Type	Adjustable Rate
Change Frequency	Monthly

April 2020: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	SAN MATEO CA
Property Address	33 WALNUT AVE, ATHERTON, CA 94027-3820
Transaction Type	Mortgage
Record Updated	Aug 5, 2022

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000037079
Date	Apr 24, 2020
Instrument	2020-037079

Lender

Name	GUARANTEED RATE AFFINITY LLC
Type	Mortgage Company
Address	CHICAGO, IL 60613

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	361 Months
Due	May 1, 2050

February 2021: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	SAN MATEO CA
Property Address	33 WALNUT AVE, ATHERTON, CA 94027-3820
Transaction Type	Mortgage
Record Updated	Aug 5, 2022
Title Company	BOSTON NATIONAL TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	33 WALNUT AVE, ATHERTON, CA 94027-3820

Mortgage

Document Number	0000025727
Date	Feb 16, 2021
Instrument	2021-025727

Lender

Name	GUARANTEED RATE INC
Type	Mortgage Company
Address	CHICAGO, IL 60613

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	361 Months
Due	Mar 1, 2051

Tax Assessment & Valuation

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	Menlo Park City Elementary School District (KG - 08)
Secondary School District	Sequoia Union High School District (09 - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value	Assessed Market Value
2026		$1,690,459 (+2%) Land $1,409,289 Building $281,170
2025	$21,115.00 (+5.11%)	$1,657,314 (+4.04%) Land $1,381,656 Building $275,658
2023	$20,089.00 (+2.5%)	$1,592,960 Land $1,328,005 Building $264,955	$1,456,110
2022	$19,599.00

Assessed value and assessed market value are set for property tax purposes and are not market price estimates.

Flood

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	4 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

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.

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 283 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
Race Communications Fiber	10,000 / 10,000
Xfinity Cable	2,000 / 250
AT&T Fixed Wireless · DSL · Fiber in parts of the area	100 / 20

May also be available: Etheric Networks, GeoLinks, T-Mobile.

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